n.a consonant that is articulated using both lips; /p/ or /b/ or /w/

adj.of or relating to or being a speech sound that is articulated using both lips

"bilabial fricatives"

Tongue surface displacement during bilabial stops
Lip and jaw kinematics in bilabial stop consonant production.
Bilabial stop and nasal consonants: a motion picture study and its acoustical implications.
Compensatory articulation during bilabial fricative production by regulating muscle stiffness
A physiological and acoustic study on voiced bilabial fricative/beta:/as a vocal exercise.
Labial and mandibular dynamics during the production of bilabial consonants: preliminary observations.
Voice onset time of voiceless bilabial and velar stops in 3-year-old bilingual children and their age-matched monolingual peers.
Letter: Influence of utterance length upon bilabial closure duration for -p- in three-, six-, and nine-year-old children.
Development of categorical identification of native and non-native bilabial stops: infants, children and adults.
Lip and jaw interaction during speech: responses to perturbation of lower-lip movement prior to bilabial closure.