labial

Of or relating to the lips or labia.

Articulated mainly by closing or partly closing the lips, as the sounds (b), (m), or (w).

A labial consonant.

In anatomy and zoology, pertaining to the lips or to a lip-like part; situated on or by a lip; having a lip-like character, as in shape, position, or office.

In entomology, pertaining to the labium, or lower lip of an insect.