Meaning of a
Definition of a
(noun)
a
metric
unit
of
length
equal
to one ten
billionth
of a
meter
(or 0.0001 micron);
used
to
specify
wavelengths of
electromagnetic
radiation
any of
several
fat-soluble
vitamins
essential
for
normal
vision; prevents
night
blindness
or
inflammation
or
dryness
of the
eyes
one of the
four
nucleotides
used
in
building
DNA; all
four
nucleotides
have
a
common
phosphate
group
and a
sugar
(ribose)
(biochemistry)
purine
base
found
in DNA and RNA; pairs with
thymine
in DNA and with
uracil
in RNA
the
basic
unit
of
electric
current
adopted
under
the Systeme International d'Unites; "a
typical
household
circuit
carries 15 to 50 amps"
the 1st
letter
of the Roman
alphabet
the
blood
group
whose red cells
carry
the A
antigen
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