produced with the lips close together or touching: the lips touch at one phase of the production of the bilabial consonants p, b, and m; they do not for the bilabial w.
a bilabial speech sound.
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British Dictionary definitions for bilabial
of, relating to, or denoting a speech sound articulated using both lips: ( p ) is a bilabial stop, ( w ) a bilabial semivowel
a bilabial speech sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012