Noun
- 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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