labialize
verb (used with object)
to give a labial character to (a sound), for example, to round (a vowel).
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The k's and g's liable to labialization in Eu. languages appear to be occasionally labialized in Dakotan languages.
From The Dakotan Languages, and Their Relations to Other Languages by A. W. (Andrew Woods) Williamson