American Heritage® Dictionary of the English Language, Fourth Edition
- v. To round (a speech sound); make labial.
Century Dictionary and Cyclopedia
- To make labial; give a labial character to; change to utterance with the lips.
GNU Webster's 1913
- v. (Phonetics) To modify by contraction of the lip opening.
- v. pronounce with rounded lips
- From labial (from Latin labium ("lip")) + the causative suffix -ize. (Wiktionary)
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