Lingual

Part of speech: noun (n.)

A consonant sound formed by the aid of the tongue; -- a term especially applied to certain articulations (as those of t, d, th, and n) and to the letters denoting them.

Part of speech: adjective (a.)

Of or pertaining to the tongue; uttered by the aid of the tongue; glossal; as, the lingual nerves; a lingual letter. Lingual ribbon. (Zoöl.) See Odontophore.