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  • noun

Synonyms for A

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron)

any of several fat-soluble vitamins essential for normal vision

one of the four nucleotides used in building DNA

(biochemistry) purine base found in DNA and RNA

the basic unit of electric current adopted under the Systeme International d'Unites

the blood group whose red cells carry the A antigen

References in periodicals archive ?
B-ring hydroxyl groups could form hydrogen bond with 3-OH by aligning the B-ring with the heterocycle and A-ring.
The neutral loss of CO2 occurred only when A-ring possesses two hydroxyl groups, so M1 was identified as 8-O- methylemodin.
He believes that if the airliner had not hit the light poles, it would have slammed into the Pentagon's 9th and 10th corridor A-ring, and the loss of life would have been greater.
Members of the British Astronomical Association, for example, have observed the A-ring [5] and the B-ring [6-7] get brighter as Saturn reached opposition which is the Seeliger effect.
Alateeda, a commercial development to be located on A-Ring road - Rawdat Al Kahlil.
The planet's oversized family of 62 moons will soon be added when the lump from A-Ring, its outermost and brightest ring, will soon come out by 2016.