Definition of labials:
(adj) :
(anatomy, zootomy) Of or pertaining to the lips or labia.
(adj) :
(linguistics, phonetics) Articulated by the lips, as the consonants b, m and w.
(n) :
(linguistics, phonetics) A consonant articulated by the lips.
(adj) :
(dentistry, of an incisor or canine) On the side facing the lips. See mesial.
(adj) :
(music) Furnished with lips.
(n) :
(music) An organ pipe having a lip that influences its sound.