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A

PRIMARY MEANINGS OF: A

1
 n
the 1st letter of the Roman alphabet
2
 n
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
3
 n
the blood group whose red cells carry the A antigen
4
 n
the basic unit of electric current adopted under the Systeme International d'Unites
5
 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
6
 n
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
FULL DEFINITIONS OF: A
1

n the 1st letter of the Roman alphabet

Synonyms:
a
Type of:
alphabetic character, letter, letter of the alphabet
the conventional characters of the alphabet used to represent speech
2

n any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

Synonyms:
antiophthalmic factor, axerophthol, vitamin A
Types:
retinol, vitamin A1
an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene
dehydroretinol, vitamin A2
a viscous alcohol that is less active in mammals than is vitamin A1
Type of:
fat-soluble vitamin
any vitamin that is soluble in fats
3

n the blood group whose red cells carry the A antigen

Synonyms:
group A, type A
Type of:
blood group, blood type
human blood cells (usually just the red blood cells) that have the same antigens
4

n the basic unit of electric current adopted under the Systeme International d'Unites

Synonyms:
amp, ampere
Type of:
current unit
a measure of the amount of electric charge flowing past a circuit point at a specific time
5

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

Synonyms:
angstrom, angstrom unit
Type of:
metric linear unit
a linear unit of distance in metric terms
6

n one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

Synonyms:
deoxyadenosine monophosphate
Type of:
base, nucleotide
a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)

n (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

Synonyms:
adenine
Type of:
purine
any of several bases that are derivatives of purine
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