Etymology
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labial (adj.)

"pertaining to the lips," 1590s, from Medieval Latin labialis "having to do with the lips," from Latin labium "lip" (see lip (n.)). The noun meaning "a labial sound" (one accomplished by complete closure of the lips) is from 1660s, from the adjective in this sense (1590s). Related: Labially.

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Definitions of labial
1
labial (adj.)
of or relating to the lips of the mouth;
labial stops
labial (adj.)
relating to or near the female labium;
2
labial (n.)
a consonant whose articulation involves movement of the lips;
Synonyms: labial consonant
From wordnet.princeton.edu