GNU Collaborative International Dictionary of English

Found 2 definitions

1.       
   Lingual , 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.
   1913 Webster
   lying near the tongue; especially, in dentistry, on the surface of the tooth next to the tongue. Contrasted with buccal, the side of a tooth touching the cheek, i. e. the side opposite to the lingual side.
   PJC
   Lingual ribbon. (Zool.) See Odontophore.
   1913 Webster
   
         
       

2.       
   Lingual, 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.
   1913 Webster
   ☞ In Sanskrit grammar certain letters, as ṭ, ṭh, ḍ, ḍh, ṇ, 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.
   1913 Webster