Synonyms for a

Noun

1. A, type A, group A, blood group, blood type

usage: the blood group whose red cells carry the A antigen

2. angstrom, angstrom unit, A, metric linear unit

usage: a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

3. vitamin A, antiophthalmic factor, axerophthol, A, fat-soluble vitamin

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

4. deoxyadenosine monophosphate, A, nucleotide

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

5. adenine, A, purine

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

6. ampere, amp, A, current unit

usage: the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"

7. A, letter, letter of the alphabet, alphabetic character

usage: the 1st letter of the Roman alphabet