Definition of "labiodental" [la•bi•o•den•tal]

• Articulated with the lower lip and upper teeth, as the sounds (f) and (v). (adjective)
• A labiodental sound. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "By that time, Olson apparently was still convinced that this phoneme wasn't a labio-dental flap: The bilabial flap is a sound very similar to what is elsewhere called the labiodental flap, but the articulation is slightly different."
• "Now, this is a matter of detail perhaps but worth noting since p has occasionally eroded to f in Etruscan, particularly next to tautosyllabic u, and this sort of lenition can only rationally happen with a bilabial phoneme, not a labiodental one."
• "An alternation between a bilabial and labiodental sound is comparatively less economic."