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
WordNet 2.1 Copyright Princeton University. All rights reserved.
