English

Noun

betacism ‎(usually uncountable, plural betacisms)

1. (linguistics) A sound change in which [b] (the voiced bilabial plosive) shifts to [v] (the voiced labiodental fricative).

   Betacism is a fairly common phenomenon: it has taken place in Greek, Hebrew, and Spanish, among others.

2. A speech disorder involving excessive use of the [b] sound, or conversion of other sounds into it.