/ Dictionary / Index L labialize: Meaning and Definition of Find definitions for: la•bi•al•ize Pronunciation: (lā'bē-u-līz"), [key] — -ized, -iz•ing. to give a labial character to (a sound), for example, to round (a vowel). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: labialize (Thesaurus) labialism labialized Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language