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1. The 2nd letter of the Roman alphabet
   - B
    
2. (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
   - barn

1. Originally thought to be a single vitamin but now separated into several B vitamins
   - B-complex vitamin, B complex, vitamin B complex, vitamin B, B vitamin
    
2. A logarithmic unit of sound intensity equal to 10 decibels
   - Bel, bel
    
3. The blood group whose red cells carry the B antigen
   - type B, group B
    
4. A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
   - boron, atomic number 5
    
5. Aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
   - bacillus

Derived forms: bs, Bs

Type of: alphabetic character, area unit, blood group, blood type, chemical element, element, eubacteria, eubacterium, letter, letter of the alphabet, sound unit, square measure, true bacteria, water-soluble vitamin

Part of: borax, genus Bacillus, kernite, Latin alphabet, Roman alphabet

Encyclopedia: B, Anthony