A
English Dictionary
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Letter A
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A Definition
(n)
the
blood
group
whose
red
cells
carry
the
A
antigen
(n)
a
metric
unit
of
length
equal
to
one
ten
billionth
of
a
meter
(
or
0
.
0001
micron
);
used
to
specify
wavelengths
of
electromagnetic
radiation
(n)
any
of
several
fat
-
soluble
vitamins
essential
for
normal
vision
;
prevents
night
blindness
or
inflammation
or
dryness
of
the
eyes
(n)
one
of
the
four
nucleotides
used
in
building
DNA
;
all
four
nucleotides
have
a
common
phosphate
group
and
a
sugar
(
ribose
)
(n) (
biochemistry
)
purine
base
found
in
DNA
and
RNA
;
pairs
with
thymine
in
DNA
and
with
uracil
in
RNA
(n)
the
basic
unit
of
electric
current
adopted
under
the
Systeme
International
d
''
Unites
; "
a
typical
household
circuit
carries
15
to
50
amps
"
(n)
the
1st
letter
of
the
Roman
alphabet
A Synonyms
A
adenine
amp
ampere
angstrom
angstrom unit
antiophthalmic factor
axerophthol
deoxyadenosine monophosphate
group A
type A
vitamin A
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