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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 classic literature ?
I take them to be roars of joy because Mary is his, and they have a ring of youth about them that is hard to bear.
They sped on together towards the fence of the town that was now but a ring of fire, Umslopogaas and Galazi in front, each holding the Lily by a hand.
The soldiers heard the voice of their captain, and they obeyed his voice, forming a double circle, a ring within a ring.
Edwin, this rose of diamonds and rubies delicately set in gold, was a ring belonging to Miss Rosa's mother.
she asked to change the subject, looking at his finger on which he wore a ring with a cameo of Laocoon's head.