prebilabial UK /ˌpɹiːbaɪˈleɪbɪəl/US /ˌpɹiːbaɪˈleɪbiəl/ adjective1 •Occurring immediately before a bilabial consonant, i.e. before /m/, /p/, /b/, /ɸ/, /β/, /β̞/, /ʙ/, or /ʘ/.
