Noun
The modification of an articulation by contraction of the lip opening.
Source: Webster's dictionaryIn Moroccan Arabic, on the other hand, short /u/ triggers labialization of nearby consonants (especially velar consonants and uvular consonants ), and then short /a i u/ all merge into /ǝ/, which is deleted in many contexts. Source: Internet
In the case of u-umlaut, this entails labialization of unrounded vowels. Source: Internet
See Tillamook language for an example of a languages with "rounded" consonants and vowels that do not have any actual labialization. Source: Internet
Similarly, a deleted /u/ may prompt labialization of a preceding consonant, though this has ceased to carry any morphological meaning. Source: Internet