| b |
| A | noun |
| 1 | Bacillus, Bacilli, B
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| | | aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil |
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| 2 | B
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| | | the 2nd letter of the Roman alphabet |
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| 3 | B, type B, group B
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| | | the blood group whose red cells carry the B antigen |
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| 4 | barn, b
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| | | (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter |
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| 5 | bel, B
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| | | a logarithmic unit of sound intensity equal to 10 decibels |
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| 6 | boron, B, atomic number 5
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| | | a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder |
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| 7 | B-complex vitamin, B complex, vitamin B complex, vitamin B, B vitamin, B
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| | | originally thought to be a single vitamin but now separated into several B vitamins |
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