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B, boron, atomic number 5 | 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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B, Bel | a logarithmic unit of sound intensity equal to 10 decibels | |
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B, b | the 2nd letter of the Roman alphabet | |
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B vitamin, B, B-complex vitamin, B complex, vitamin B complex, vitamin B | originally thought to be a single vitamin but now separated into several B vitamins | |
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B, bacillus | aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil | |
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barn, b | [in nuclear_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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B, type B, group B | the blood group whose red cells carry the B antigen |