A — synonyms, definition

1. a (Noun)

11 synonyms
AMP adenine ampere angstrom angstrom unit antiophthalmic factor axerophthol deoxyadenosine monophosphate group A type A vitamin A
7 definitions

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.

a (Noun) — The 1st letter of the Roman alphabet.

a (Noun) — One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).

a (Noun) — (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.

a (Noun) — Any of several fat-soluble vitamins essential for normal vision; prevents night blindness, inflammation or dryness of the eyes.

a (Noun) — The blood group whose red cells carry the A antigen.

a (Noun) — The basic unit of electric current adopted under the Systeme International d'Unites. ex. "a typical household circuit carries 15 to 50 As"

11 types of
alphabetic character base blood group blood type current unit fat-soluble vitamin letter letter of the alphabet metric linear unit nucleotide purine
4 types
dehydroretinol retinol vitamin A1 vitamin A2
5 parts
ma micromicron milliampere picometer picometre
15 parts of
DNA Latin alphabet RNA Roman alphabet abamp abampere deoxyribonucleic acid desoxyribonucleic acid micromillimeter micromillimetre millimicron nanometer nanometre nm ribonucleic acid

2. a (Other)

1 definition

a (Other) — Indefinite article, "an" is used before a vowel sound, "a" otherwise.