Definitions of B:
- noun: the 2nd letter of the Roman alphabet
- noun: the blood group whose red cells carry the B antigen
- noun: (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
- noun: a logarithmic unit of sound intensity equal to 10 decibels
- noun: a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
- noun: aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
- noun: originally thought to be a single vitamin but now separated into several B vitamins
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