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The Collaborative International Dictionary
Interdental

Interdental \In`ter*den"tal\, a.

  1. Situated between teeth; as, an interdental space, the space between two teeth in a gear wheel.

  2. (Phon.) Formed between the upper and lower teeth; as, interdental consonants.

Wiktionary
interdental

a. 1 Pertaining to the space between the teeth. 2 (context phonetics English) Pronounced with the tongue between the top and bottom teeth. n. (context phonetics English) A speech sound pronounced with the tongue between the top and bottom teeth.