Words beginning with SI

1,193 words and phrases start with the letters SI.

Si(noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust;…
SI system(noun) a complete metric system of units of measurement for scientists; fundamental quantities are length (meter)…
SI unit(noun) a complete metric system of units of measurement for scientists; fundamental quantities are length (meter)…
sial(noun) the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum
sialadenitis(noun) inflammation of the salivary glands
Sialia(noun) North American bluebirds
Sialidae(noun) an arthropod family including: alderflies
Sialis(noun) type genus of the Sialidae
Sialis lutaria(noun) dark-colored insect having predaceous aquatic larvae
sialolith(noun) a stone formed in the salivary gland
Siam(noun) a country of southeastern Asia that extends southward along the Isthmus of Kra to the Malay Peninsula
siamang(noun) large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web
Siamese(noun) a branch of the Tai languages
Siamese cat(noun) a slender short-haired blue-eyed breed of cat having a pale coat with dark ears paws face and tail tip
siamese connection(noun) an inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into…
Siamese twin(noun) one of a pair of identical twins born with their bodies joined at some point
Sian(noun) a city of central China; capital of ancient Chinese empire 221-206 BC
sib(noun) a person's brother or sister
Sibelius(noun) Finnish composer (1865-1957)
Siberia(noun) a vast Asian region of Russia; famous for long cold winters
Siberian(adjective) of or relating to or characteristic of Siberia or the Siberians
Siberian crab(noun) Asian wild crab apple cultivated in many varieties for it small acid usually red fruit used for preserving
Siberian crab apple(noun) Asian wild crab apple cultivated in many varieties for it small acid usually red fruit used for preserving
Siberian elm(noun) fast-growing shrubby Asian tree naturalized in United States for shelter or ornament
Siberian husky(noun) breed of sled dog developed in northeastern Siberia; they resemble the larger Alaskan malamutes
Siberian larch(noun) medium-sized larch of northeastern Russia and Siberia having narrowly conic crown and soft narrow…
Siberian millet(noun) millet having orange to reddish grains in long bristly spikes
Siberian pea tree(noun) large spiny shrub of eastern Asia having clusters of yellow flowers; often cultivated in shelterbelts and…
Siberian spruce(noun) tall spruce of northern Europe and Asia; resembles Norway spruce
Siberian wall flower(noun) showy erect biennial or short-lived perennial cultivated for its terminal racemes of orange-yellow flowers;…
sibilant(adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both…
sibilant consonant(noun) a consonant characterized by a hissing sound (like s or sh)
sibilate(verb) make a sharp hissing sound, as if to show disapproval
sibilation(noun) a fricative sound (especially as an expression of disapproval)
Sibine(noun) a Chadic language spoken in Chad
Sibley tent(noun) a light conical canvas tent erected on a tripod with ventilation at the top
sibling(noun) a person's brother or sister
sibyl(noun) a woman who tells fortunes
sibyllic(adjective) resembling or characteristic of a prophet or prophecy
sibylline(adjective) resembling or characteristic of a prophet or prophecy
sic(adverb) intentionally so written (used after a printed word or phrase)
siccative(noun) a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
Sichuan(noun) a populous province of south central China
Sicilia(noun) the Italian region on the island of Sicily
Sicilian(adjective) of or relating to or characteristic of Sicily or the people of Sicily
Sicilian Mafia(noun) a secret terrorist group in Sicily; originally opposed tyranny but evolved into a criminal organization in…
Sicilian pizza(noun) pizza made with a thick crust
Sicily(noun) the Italian region on the island of Sicily
sick(adjective) affected by an impairment of normal physical or mental function
sick-abed(adjective) confined to bed (by illness)
sick bag(noun) a bag provided on an airplane for passengers who are suffering from airsickness and need to vomit
sick benefit(noun) money paid (by the government) to someone who is too ill to work
sick berth(noun) (nautical) a room for the treatment of the sick or injured (as on a ship)
sick call(noun) the daily military formation at which individuals report to the medical officer as sick
sick headache(noun) a headache accompanied by nausea
sick joke(noun) a joke in bad taste
sick leave(noun) a leave of absence from work because of illness
sick list(noun) a list of those who are ill (e.g. on a warship or in a regiment etc)
sick of(adjective) having a strong distaste from surfeit
sick parade(noun) the daily military formation at which individuals report to the medical officer as sick
sick pay(noun) wages paid to an employee who is on sick leave
sick person(noun) a person suffering from an illness
sickbag(noun) a bag provided on an airplane for passengers who are suffering from airsickness and need to vomit
sickbay(noun) (nautical) a room for the treatment of the sick or injured (as on a ship)
sickbed(noun) the bed on which a sick person lies
sicken(verb) cause aversion in; offend the moral sense of
sickening(adjective) causing or able to cause nausea
sickeningly(adverb) in a disgusting manner or to a disgusting degree
sickeningness(noun) extreme unpalatability to the mouth
sickish(adjective) feeling nausea; feeling about to vomit
sickle(noun) an edge tool for cutting grass or crops; has a curved blade and a short handle
sickle-cell anaemia(noun) a congenital form of anemia occurring mostly in blacks; characterized by abnormal blood cells having a…
sickle-cell anemia(noun) a congenital form of anemia occurring mostly in blacks; characterized by abnormal blood cells having a…
sickle-cell disease(noun) a congenital form of anemia occurring mostly in blacks; characterized by abnormal blood cells having a…
sickle-shaped(adjective) curved like a sickle
sickle alfalfa(noun) European medic naturalized in North America having yellow flowers and sickle-shaped pods
sickle cell(noun) an abnormal red blood cell that has a crescent shape and an abnormal form of hemoglobin
sickle feather(noun) one of the long curved tail feathers of a rooster
sickle lucerne(noun) European medic naturalized in North America having yellow flowers and sickle-shaped pods
sickle medick(noun) European medic naturalized in North America having yellow flowers and sickle-shaped pods
sicklepod(noun) cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed…
sickleweed golden aster(noun) a variety of golden aster
sickly(adjective) unhealthy looking
sickness(noun) impairment of normal physiological function affecting part or all of an organism
sickness benefit(noun) money paid (by the government) to someone who is too ill to work
sickroom(noun) a room to which a sick person is confined
Sid Caesar(noun) United States comedian who pioneered comedy television shows (born 1922)
Sida(noun) large genus of tropical subshrubs or herbs some of which yield fibers of mucilaginous substances
Sida hermaphrodita(noun) tall handsome perennial herb of southeastern United States having maplelike leaves and white flowers
Sida rhombifolia(noun) herb widely distributed in tropics and subtropics used for forage and medicinally as a demulcent and having a…
Sida spinosa(noun) tropical American weed having pale yellow or orange flowers naturalized in southern United States
Sidalcea(noun) genus of showy plants of western North America having palmate leaves and variously colored racemose flowers
Sidalcea malviflora(noun) perennial purple-flowered wild mallow of western North America that is also cultivated
Siddhartha(noun) founder of Buddhism (c 563-483 BC)
Siddons(noun) English actress noted for her performances in Shakespearean roles (1755-1831)
side(noun) a place within a region identified relative to a center or reference location
side-blotched lizard(noun) one of the most abundant lizards in the arid western United States
side-glance(noun) a glance sideways
side-look(noun) a glance sideways
side-slip(verb) slide sideways through the air in a downward direction in an airplane along an inclined lateral axis

side-to-side(adjective) alternately left and right with respect to a central point
side-wheeler(noun) a paddle steamer having a paddle wheel on each side
side-whiskers(noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of…
side arm(noun) a firearm that is held and fired with one hand
side by side(adjective) nearest in space or position; immediately adjoining without intervening space
side chair(noun) a straight-backed chair without arms
side chapel(noun) a small chapel off the side aisle of a church
side dish(noun) a dish that is served with, but is subordinate to, a main course
side door(noun) an exterior door at one side of a building
side drum(noun) a small drum with two heads and a snare stretched across the lower head
side effect(noun) a secondary and usually adverse effect of a drug or therapy
side entrance(noun) an exterior door at one side of a building
side horse(noun) a gymnastic horse with a cylindrical body covered with leather and two upright handles (pommels) near the…
side judge(noun) a football official
side of bacon(noun) salted and cured abdominal wall of a side of pork
side of beef(noun) dressed half of a beef carcass
side of meat(noun) a lengthwise dressed half of an animal's carcass used for food
side of pork(noun) dressed half of a hog carcass
side order(noun) a dish that is served with, but is subordinate to, a main course
side pocket(noun) a pocket on the side of a billiard table
side road(noun) a minor road branching off of a main road
side street(noun) a street intersecting a main street and terminating there
side view(noun) a view from the side of something
side yard(noun) the grounds at either side of a house
sidearm(adjective) (of pitches) made with the arm moving parallel to the ground
sidebar(noun) (law) a courtroom conference between the lawyers and the judge that is held out of the jury's hearing
sideboard(noun) a removable board fitted on the side of a wagon to increase its capacity
sideburn(noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of…
sidecar(noun) a cocktail made of orange liqueur with lemon juice and brandy
sidekick(noun) a close friend who accompanies his buddies in their activities
sidelight(noun) light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port…
sideline(noun) a line that marks the side boundary of a playing field
sidelong(adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy
sidereal(adjective) of or relating to the stars or constellations
sidereal day(noun) the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a…
sidereal hour(noun) 1/24 of a sidereal day
sidereal month(noun) period between successive conjunctions with a star, 27.322 days
sidereal time(noun) measured by the diurnal motion of stars
sidereal year(noun) the time for the earth to make one complete revolution around the sun, relative to the fixed stars
siderite(noun) iron ore in the form of ferrous carbonate
Sideritis(noun) genus of woolly aromatic herbs or subshrubs or shrubs of Mediterranean region
sideroblast(noun) an erythroblast having granules of ferritin
sideroblastic anaemia(noun) refractory anemia characterized by sideroblasts in the bone marrow
sideroblastic anemia(noun) refractory anemia characterized by sideroblasts in the bone marrow
siderochrestic anaemia(noun) refractory anemia characterized by sideroblasts in the bone marrow
siderochrestic anemia(noun) refractory anemia characterized by sideroblasts in the bone marrow
siderocyte(noun) an abnormal red blood cell containing granules of iron not bound in hemoglobin
sideropenia(noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage
siderophilin(noun) a globulin in blood plasma that carries iron
siderosis(noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers
sidesaddle(adverb) on or as if on a sidesaddle
sideshow(noun) a subordinate incident of little importance relative to the main event
sideslip(noun) an unexpected slide
sidesman(noun) (Church of England) an assistant to the churchwarden; collects offerings of money in the church
sidesplitter(noun) a joke that seems extremely funny
sidesplitting(adjective) very funny
sidesplittingly(adverb) in a very humorous manner
sidestep(verb) avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)
sidestroke(noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick
sideswipe(noun) a glancing blow from or on the side of something (especially motor vehicles)
sidetrack(noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
sidewalk(noun) walk consisting of a paved area for pedestrians; usually beside a street or roadway
sidewall(noun) the side of an automobile tire
sideward(adverb) toward one side
sidewards(adverb) toward one side
sideway(adverb) toward one side
sideways(adverb) toward one side
sidewinder(noun) small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve
sidewise(adverb) toward one side
siding(noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
sidle(verb) move unobtrusively or furtively
sidle up(verb) ingratiate oneself to; often with insincere behavior
Sidney(noun) English poet (1554-1586)
Sidney Caesar(noun) United States comedian who pioneered comedy television shows (born 1922)
Sidney James Webb(noun) English sociologist and economist and a central member of the Fabian Society (1859-1947)
Sidney Poitier(noun) United States film actor and director (born in 1927)
Sidney Webb(noun) English sociologist and economist and a central member of the Fabian Society (1859-1947)
Sidon(noun) the main city of ancient Phoenicia
Sidonie-Gabrielle Claudine Colette(noun) French writer of novels about women (1873-1954)
Sidonie-Gabrielle Colette(noun) French writer of novels about women (1873-1954)
SIDS(noun) sudden and unexpected death of an apparently healthy infant during sleep
siege(noun) the action of an armed force that surrounds a fortified place and isolates it while continuing to attack
siege of Orleans(noun) a long siege of Orleans by the English was relieved by Joan of Arc in 1429
siege of Syracuse(noun) the Roman siege of Syracuse (214-212 BC) was eventually won by the Romans who sacked the city (killing…
siege of Vicksburg(noun) a decisive battle in the American Civil War (1863); after being besieged for nearly seven weeks the…
siege of Yorktown(noun) in 1781 the British under Cornwallis surrendered after a siege of three weeks by American and French troops;…
Siege Perilous(noun) the legendary seat at King Arthur's Round Table reserved for the knight who would find the Holy Grail; it was…
Siegfried(noun) (German mythology) mythical German warrior hero of the Nibelungenlied who takes possession of the accursed…
Siegfried line(noun) German fortifications facing the Maginot Line
siemens(noun) a unit of conductance equal to the reciprocal of an ohm
sienna(noun) an earth color containing ferric oxides; used as a pigment
sierra(noun) a range of mountains (usually with jagged peaks and irregular outline)
Sierra Leone(noun) a republic in West Africa; achieved independence from the United Kingdom in 1961
Sierra Leone monetary unit(noun) monetary unit in Sierra Leone
Sierra Leonean(adjective) of or relating to Sierra Leone or its people
Sierra lodgepole pine(noun) tall subspecies of lodgepole pine
Sierra Madre Occidental(noun) a mountain range in northwestern Mexico that runs south from Arizona parallel to the Pacific coastline
Sierra Madre Oriental(noun) a mountain range in northeastern Mexico the runs parallel to the coastline of the Gulf of Mexico
Sierra Nevada(noun) a mountain range in southern Spain along the Mediterranean coast to the east of Granada
Sierra Nevada Mountains(noun) a mountain range in eastern California; contains Mount Whitney