Words beginning with SI (page 2)

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

Sierra plum(noun) shrub of the Pacific coast of the United States bearing small red insipid fruit
Sierra redwood(noun) extremely lofty evergreen of southern end of western foothills of Sierra Nevada in California; largest living…
siesta(noun) a nap in the early afternoon (especially in hot countries)
Sieur de LaSalle(noun) French explorer who claimed Louisiana for France (1643-1687)
sieva bean(noun) bush bean plant cultivated especially in southern United States having small flat edible seeds
sieve(verb) separate by passing through a sieve or other straining device to separate out coarser elements
sieve out(verb) separate or remove
sieve tube(noun) tube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae
Sif(noun) (Norse mythology) wife of Thor and guardian of the home
sift(verb) move as if through a sieve
sifter(noun) a household sieve (as for flour)
sifting(noun) the act of separating grain from chaff
sigeh(noun) a Shiite tradition of temporary marriage permitted in Iran that allows a couple to specify the terms of their…
sigh(verb) heave or utter a sigh; breathe deeply and heavily
sight(noun) an instance of visual perception
sight-read(verb) perform music from a score without having seen the score before
sight-sing(verb) sing from a score without having seen it before
sight bill(noun) a draft payable on presentation
sight draft(noun) a draft payable on presentation
sight gag(noun) a joke whose effect is achieved by visual means rather than by speech (as in a movie)
sight setting(noun) the adjustment of a gunsight for elevation and windage on a particular range under favorable light conditions
sighted(adjective) able to see
sightedness(noun) normal use of the faculty of vision
sighting(noun) the act of observing
sightless(adjective) lacking sight
sightlessness(noun) the state of being blind or lacking sight
sightly(adjective) very pleasing to the eye
sightread(verb) perform music from a score without having seen the score before
sightreader(noun) a performer who reads without preparation or prior acquaintance (as in music)
sights(noun) an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
sightsee(verb) visit famous or interesting sights
sightseeing(noun) going about to look at places of interest
sightseer(noun) a tourist who is visiting sights of interest
sightsing(verb) sing from a score without having seen it before
SIGINT(noun) intelligence information gathered from communications intelligence or electronics intelligence or telemetry…
sigma(noun) the 18th letter of the Greek alphabet
Sigmodon(noun) American cotton rats
Sigmodon hispidus(noun) destructive long-haired burrowing rat of southern North America and Central America
sigmoid(adjective) curved in two directions (like the letter S)
sigmoid colon(noun) the s-shaped curve between the descending colon and the rectum
sigmoid flexure(noun) the s-shaped curve between the descending colon and the rectum
sigmoid sinus(noun) an S-shaped dural sinus on the temporal and occipital bones
sigmoid vein(noun) tributaries of the inferior mesenteric vein; drains the sigmoid colon
sigmoidal(adjective) of or relating to the sigmoid flexure in the large intestine
sigmoidectomy(noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor)
sigmoidoscope(noun) an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon
sigmoidoscopy(noun) visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps
Sigmund Freud(noun) Austrian neurologist who originated psychoanalysis (1856-1939)
Sigmund Romberg(noun) United States composer (born in Hungary) who composed operettas (1887-1951)
sign(noun) a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
sign-language(adjective) used of the language of the deaf
sign away(verb) formally assign ownership of
sign in(verb) announce one's arrival, e.g. at hotels or airports
sign industry(noun) an industry that produces signs
sign language(noun) language expressed by visible hand gestures
sign manual(noun) the signature of a sovereign on an official document
sign of the cross(noun) a gesture with the right hand moving to form a cross; used by Catholics as a profession of faith
sign of the zodiac(noun) (astrology) one of 12 equal areas into which the zodiac is divided
sign off(verb) cease broadcasting; get off the air; as of radio stations
sign on(verb) engage by written agreement
sign over(verb) formally assign ownership of
sign painter(noun) someone who paints signs and billboards etc.
sign up(verb) engage by written agreement
signage(noun) signs collectively (especially commercial signs or posters)
signal(noun) any nonverbal action or gesture that encodes a message
signal-to-noise(noun) the ratio of signal intensity to noise intensity
signal-to-noise ratio(noun) the ratio of signal intensity to noise intensity
signal/noise(noun) the ratio of signal intensity to noise intensity
signal/noise ratio(noun) the ratio of signal intensity to noise intensity
signal box(noun) a building from which signals are sent to control the movements of railway trains
signal caller(noun) (football) the person who plays quarterback
signal detection(noun) the detection that a signal is being received
signal fire(noun) a fire set as a signal
signal flag(noun) a rectangular piece of fabric used as a signalling device
signal level(noun) the amplitude level of the desired signal
signal light(noun) a fire set as a signal
signal tower(noun) a building from which signals are sent to control the movements of railway trains
signaler(noun) someone who communicates by signals
signaling(noun) any nonverbal action or gesture that encodes a message
signaling device(noun) a device used to send signals
signalisation(noun) a conspicuous indication
signalise(verb) provide with traffic signals
signalization(noun) a conspicuous indication
signalize(verb) provide with traffic signals
signaller(noun) someone who communicates by signals
signally(adverb) as a signal
signalman(noun) a railroad employee in charge of signals and point in a railroad yard
signals intelligence(noun) intelligence information gathered from communications intelligence or electronics intelligence or telemetry…
signatory(noun) someone who signs and is bound by a document
signature(noun) your name written in your own handwriting
signature recognition(noun) biometric identification by automatically scanning a person's signature and matching it electronically…
signature tune(noun) a melody used to identify a performer or a dance band or radio/tv program
signboard(noun) structure displaying a board on which advertisements can be posted
signed(adjective) having a handwritten signature
signer(noun) someone who can use sign language to communicate
signet(noun) a seal (especially one used to mark documents officially)
signet ring(noun) a ring bearing a signet
significance(noun) the quality of being significant
significant(adjective) important in effect or meaning
significant digit(noun) any digit of a number that is known with certainty; any digit of a number beginning with the leftmost…

significant figure(noun) any digit of a number that is known with certainty; any digit of a number beginning with the leftmost…
significant other(noun) a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship
significantly(adverb) in a statistically significant way
signification(noun) the message that is intended or expressed or signified
significative(adjective) (usually followed by `of') pointing out or revealing clearly
signified(noun) the meaning of a word or expression; the way in which a word or expression or situation can be interpreted
signifier(noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify…
signify(verb) denote or connote
signing(noun) language expressed by visible hand gestures
signior(noun) used as an Italian courtesy title; can be prefixed to the name or used separately
signor(noun) used as an Italian courtesy title; can be prefixed to the name or used separately
signora(noun) an Italian title of address equivalent to Mrs. when used before a name
signore(noun) an Italian title of respect for a man; equivalent to the English `sir'; used separately (not prefixed to his…
signorina(noun) an Italian courtesy title for an unmarried woman; equivalent to `Miss', it is either used alone or before a…
signory(noun) the estate of a seigneur
signpost(noun) a post bearing a sign that gives directions or shows the way
Sigrid Undset(noun) Norwegian novelist (1882-1949)
Sigurd(noun) (Norse mythology) mythical Norse warrior hero who gains an accursed hoard of gold and was killed by Brynhild;…
Sigyn(noun) (Norse mythology) wife of Loki; held a cup over him during his punishment to spare him the pain of drops of…
Sihasapa(noun) a member of a group of Siouan people who constituted a division of the Teton Sioux
sika(noun) small deer of Japan with slightly forked antlers
Sikh(adjective) of or relating to the Sikhs or their religious beliefs and customs
Sikhism(noun) the doctrines of a monotheistic religion founded in northern India in the 16th century by Guru Nanak and…
Sikkim(noun) a state in northeastern India in the Himalaya Mountains between Nepal and Bhutan
Sikorsky(noun) United States industrialist (born in Russia) who designed the first four-engine airplane and the first…
silage(noun) fodder harvested while green and kept succulent by partial fermentation as in a silo
sild(noun) any of various young herrings (other than brislings) canned as sardines in Norway
sildenafil(noun) virility drug (trade name Viagra) used to treat erectile dysfunction in men
sildenafil citrate(noun) virility drug (trade name Viagra) used to treat erectile dysfunction in men
silence(noun) the state of being silent (as when no one is speaking)
silenced(adjective) reduced to silence
silencer(noun) short tube attached to the muzzle of a gun that deadens the sound of firing
silene(noun) any plant of the genus Silene
Silene acaulis(noun) tuft- or mat-forming dwarf perennial of Arctic regions of western and central Europe and North America
Silene caroliniana(noun) perennial of eastern and central North America having short-stalked pink or white flowers in hairy clusters
Silene dioica(noun) biennial European catchfly having red or pink flowers; sometimes placed in genus Lychnis
Silene latifolia(noun) bluish-green herb having sticky stems and clusters of large evening-opening white flowers with much-inflated…
Silene uniflora(noun) perennial of Arctic Europe having large white flowers with inflated calyx
Silene virginica(noun) perennial herb of eastern North America, having red flowers with narrow notched petals
Silene vulgaris(noun) perennial of Arctic Europe having large white flowers with inflated calyx
silent(adjective) marked by absence of sound
silent butler(noun) a small receptacle with a handle and a hinged lid; used for collecting crumbs or ashes
silent movie(noun) a movie without a soundtrack
silent partner(noun) a partner (who usually provides capital) whose association with the enterprise is not public knowledge
silent person(noun) a person who does not talk
silent picture(noun) a movie without a soundtrack
silent treatment(noun) an aloof refusal to speak to someone you know
silently(adverb) without speaking
silents(noun) a movie without a soundtrack
silenus(noun) any of the minor woodland deities who were companions of Dionysus (similar to the satyrs)
Silesia(noun) a region of central Europe rich in deposits of coal and iron ore; annexed by Prussia in 1742 but now largely…
silex(noun) a pure form of finely ground silica
silhouette(verb) project on a background, such as a screen, like a silhouette
silica(noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as…
silica gel(noun) a porous form of silica that is highly absorbent
silicate(noun) a salt or ester derived from silicic acid
siliceous(adjective) relating to or containing or resembling silica
silicic acid(noun) a jellylike substance (hydrated silica)
silicide(noun) any of various compounds of silicon with a more electropositive element or radical
silicious(adjective) relating to or containing or resembling silica
silicle(noun) short broad silique occurring in some cruciferous plants
silicon(noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust;…
silicon bronze(noun) a bronze with 2-3% silicon that is resistant to corrosion
silicon carbide(noun) an extremely hard blue-black crystalline compound (SiC) used as an abrasive and a heat refractory material;…
silicon chip(noun) electronic equipment consisting of a small crystal of a silicon semiconductor fabricated to carry out a…
silicon dioxide(noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as…
silicon oxide(noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as…
Silicon Valley(noun) a region in California to the south of San Francisco that is noted for its concentration of high-technology…
silicone(noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in…
silicone polymer(noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in…
silicone resin(noun) a polymeric silicone compound
silicone rubber(noun) made from silicone elastomers; retains flexibility resilience and tensile strength over a wide temperature…
silicosis(noun) a lung disease caused by inhaling particles of silica or quartz or slate
siliqua(noun) narrow elongated seed capsule peculiar to the family Cruciferae
silique(noun) narrow elongated seed capsule peculiar to the family Cruciferae
silk(noun) a fabric made from the fine threads produced by certain insect larvae
silk-cotton tree(noun) massive tropical tree with deep ridges on its massive trunk and bearing large pods of seeds covered with…
silk-lined(adjective) having a silk lining
silk cotton(noun) a plant fiber from the kapok tree; used for stuffing and insulation
silk gland(noun) silk-producing gland of insects (especially of a silkworm) or spiders
silk grass(noun) valuable forage grass of dry upland areas and plains of western North America to northern Mexico
silk hat(noun) a man's hat with a tall crown; usually covered with silk or with beaver fur
silk oak(noun) any of several Australian timber trees having usually fernlike foliage and mottled wood used in cabinetry and…
Silk Road(noun) an ancient trade route between China and the Mediterranean (4,000 miles); followed by Marco Polo in the 13th…
silk screen print(noun) a print made using a stencil process in which an image or design is superimposed on a very fine mesh screen…
silk stocking(noun) women's stockings made from a sheer material (nylon or rayon or silk)
silk tree(noun) attractive domed or flat-topped Asiatic tree having bipinnate leaves and flowers with long silky stamens
silk vine(noun) deciduous climber for arches and fences having ill-scented but interesting flowers and poisonous yellow…
silk wood(noun) a fast-growing tropical American evergreen having white flowers and white fleshy edible fruit; bark yields a…
silken(adjective) having a smooth, gleaming surface reflecting light
silkgrass(noun) valuable forage grass of dry upland areas and plains of western North America to northern Mexico
silkily(adverb) in a silky manner
silkiness(noun) the smooth feel of silk fabric
silklike(adjective) having a smooth, gleaming surface reflecting light
silks(noun) the brightly colored garments of a jockey; emblematic of the stable
silkscreen(noun) a print made using a stencil process in which an image or design is superimposed on a very fine mesh screen…
silkweed(noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds…
silkwood(noun) a fast-growing tropical American evergreen having white flowers and white fleshy edible fruit; bark yields a…
silkworm(noun) the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can…
silkworm moth(noun) any silkworm moth of the family Saturniidae