1. between teeth.
  2. Phonetics. articulated with the tip of the tongue between the upper and lower front teeth, as the fricatives (th̸) and (th) of thy and thigh.

Origin of interdental

First recorded in 1870–75; inter- + dental
Related formsin·ter·den·tal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interdental


  1. situated between teeth
  2. phonetics (of a consonant) pronounced with the tip of the tongue lying between the upper and lower front teeth, as for the th sounds in English thin and then
Derived Formsinterdentally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

interdental in Medicine


  1. Located or made for use between the teeth.
  2. Of or relating to the relationship between the proximal surfaces of the teeth of the same arch.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.