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Dictionary definition for: B

1. (n) the blood group whose red cells carry the B antigen

2. (n) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil

3. (n) originally thought to be a single vitamin but now separated into several B vitamins

4. (n) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

5. (n) a logarithmic unit of sound intensity equal to 10 decibels

6. (n) (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter

7. (n) the 2nd letter of the Roman alphabet

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