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Meaning of interdental

in•ter•den•tal

Pronunciation: (in"tur-den'tl), [key]
— adj.
  1. between teeth.
  2. articulated with the tip of the tongue between the upper and lower front teeth, as the fricatives (&thslash;) and (th) of thy and thigh.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.