A

(noun) the blood group whose red cells carry the A antigen
synonyms : group a , type a
(noun) the 1st letter of the Roman alphabet
(noun) the basic unit of electric current adopted under the Systeme International d'Unites
"a typical household circuit carries 15 to 50 amps"
synonyms : amp , ampere
(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
synonyms : angstrom , angstrom unit
(noun) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
synonyms : adenine
(noun) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
synonyms : deoxyadenosine monophosphate
(noun) 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

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