Labialization n. : The modification of an articulation by contraction of the lip opening.

Example:


Taxonomy
labialisation, vowels, lips, consonants, front vowels, languages, Ubykh, kʷ, free encyclopedia, articulations, the Northwest, diacritic, loss, velarisation, assimilation, fricatives, three degrees, segments.

Defination from the web:
Labialization) Jump to: navigation, search. Sound change and ... Labialization (before rounded vowels) Initial voicing (before a vowel) Final devoicing (before silence) Metaphony (vowel harmony, umlaut) Consonant harmony ...