Abbreviation of back-up.

(music) The major key with B as its tonic, with the notes B, C♯, D♯, E, F♯, G♯, and A♯, the key signature of which has five sharps. / (music) The major chord with a root of B.

plural of B cell

(aviation) Initialism of Automatic dependent surveillance – broadcast. (automated broadcast of aircraft location information from satellite navigation systems to air traffic control networks)

(slang) basketball

(Britain) Any of many minor roads in Britain, typically branching off of A roads and travelling to smaller towns and villages

a pesticide consisting of hydrocyanic acid absorbed on pellets of diatomaceous earth; when exposed to the air hydrogen cyanide is released; used most infamously during the Nazi Holocaust in some gas chambers.

Alternative spelling of R & B

Abbreviation of rhythm and blues. / Ellipsis of contemporary R&B.

Initialism of breaking and entering; burglary in general.