betacism

== English == === Etymology === From beta +‎ -cism (“phenomenon related to a specific phoneme”). === Pronunciation === IPA(key): /ˈbiːtəsɪzəm/ === Noun === betacism (usually uncountable, plural betacisms) (phonology) A sound change in which [b] (the voiced bilabial plosive) shifts to [v] (the voiced labiodental fricative). A speech disorder involving excessive use of the [b] sound, or conversion of other sounds into it.