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a
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,
a
noun()the blood group whose red cells carry the A antigen
Synonyms: group a, type a,
a
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,
a
noun()the basic unit of electric current adopted under the Systeme International d'Unites
Examples:
A typical household circuit carries 15 to 50 amps.
a
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,
a
noun()(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
Synonyms: adenine,
a
noun()the 1st letter of the Roman alphabet