(Internet slang) banned (blocked from participation).

Abbreviation of bachelor: used in abbreviations of names of bachelor's degrees, usually followed by an abbreviation indicating the specific discipline. / (law) Abbreviation of baron.

(text messaging) bat

Alternative form of BA

plural of B

plural of b

(euphemistic) Any of various taboo words beginning with the letter B, particularly bitch.

(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.

(trains) A locomotive with an engine, generator, and traction motors, but without a control cab.

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.