A

Definition

noun
Abbreviation for the following:
(biochemistry) adenine, i.e. a purine nucleobase in DNA and RNA
(physics) Symbol for mass number
(medicine) “A”, a human blood type of the ABO system containing the A antigen. Somebody with this type of blood can donate to people of the same group or of the ab group, and can receive blood from people with this type or with type O.

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