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