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Wikipedia definition
1. BetacismIn historical linguistics, betacism is a sound change in which [b b] (the voiced bilabial plosive, like in bane) shifts to [v v] (the voiced labiodental fricative, like in English vane). Betacism is a fairly common phenomenon; it has taken place in Greek, Hebrew, and Spanish, among others. In Classical Greek, the letter beta <β> denoted [b b]. As a result of betacism, it has come to denote [v v] in Modern Greek. (. ) Indeed, this is the origin of the word betacism.
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