Definition of bilabial noun from the Oxford Advanced Learner's Dictionary

bilabial

noun
ˌbaɪˈleɪbiəl
 
; ˌbaɪˈleɪbiəl
 
(phonetics)
 
a speech sound made by using both lips, such as /b/ /p/ and /m/ in /buy/ /pie/ and /my/
bilabial adjective
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