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Meaning of a
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From WordNet (r) 3.0 (2006) [wn]:
A
n 1: a metric unit of length equal to one ten billionth of a
meter (or 0.0001 micron); used to specify wavelengths of
electromagnetic radiation [syn: {angstrom}, {angstrom
unit}, {A}]
2: any of several fat-soluble vitamins essential for normal
vision; prevents night blindness or inflammation or dryness
of the eyes [syn: {vitamin A}, {antiophthalmic factor},
{axerophthol}, {A}]
3: one of the four nucleotides used in building DNA; all four
nucleotides have a common phosphate group and a sugar
(ribose) [syn: {deoxyadenosine monophosphate}, {A}]
4: (biochemistry) purine base found in DNA and RNA; pairs with
thymine in DNA and with uracil in RNA [syn: {adenine}, {A}]
5: the basic unit of electric current adopted under the Systeme
International d'Unites; "a typical household circuit carries
15 to 50 amps" [syn: {ampere}, {amp}, {A}]
6: the 1st letter of the Roman alphabet [syn: {A}, {a}]
7: the blood group whose red cells carry the A antigen [syn:
{A}, {type A}, {group A}]
WordNet ® Princeton University. http://wordnet.princeton.edu
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