Lingual \Lin"gual\, 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.

Note: In Sanskrit grammar certain letters, as [.t], [.t]h, [dsdot], [dsdot]h, [.n], are called linguals, cerebrals, or cacuminals. They are uttered with the tip of the tongue turned up and drawn back into the dome of the palate.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Lingual \Lin"gual\ (l[i^][ng]"gwal), a. [L. lingua tongue: cf. F. lingual. See Tongue, and cf. Language.]

Of or pertaining to the tongue; uttered by the aid of the tongue; glossal; as, the lingual nerves; a lingual letter.

Lingual ribbon. (Zo["o]l.) See Odontophore.

Source: Webster's Revised Unabridged Dictionary (1913)