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
   "The physicist measured the collision probability in bs";
   - barn

1. The blood group whose red cells carry the B antigen
   - type B, group B
    
2. 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
    
3. 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
    
4. A logarithmic unit of sound intensity equal to 10 decibels
   "The sound level meter could measure up to 12 Bs";
   - Bel, bel
    
5. Rod-shaped bacteria, some of which can form spores
   - 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