1. bacillus, B, eubacteria, eubacterium, true bacteria

usage: aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil

2. B-complex vitamin, B complex, vitamin B complex, vitamin B, B vitamin, B, water-soluble vitamin

usage: originally thought to be a single vitamin but now separated into several B vitamins

3. boron, B, atomic number 5, chemical element, element

usage: a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

4. Bel, B, sound unit

usage: a logarithmic unit of sound intensity equal to 10 decibels

5. barn, b, area unit, square measure

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

6. B, b, letter, letter of the alphabet, alphabetic character

usage: the 2nd letter of the Roman alphabet

7. B, type B, group B, blood group, blood type

usage: the blood group whose red cells carry the B antigen

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See also: b (Dictionary)