Etymology
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lingual (adj.)

"of or pertaining to the tongue," 1640s, from Medieval Latin lingualis "of the tongue," from Latin lingua "tongue," also "speech, language," from Old Latin dingua, from PIE *dnghu- "tongue" (source also of Old English tunge "tongue;" see tongue (n.)). Altered in Latin probably in part by association with lingere "to lick." Earlier "tongue-shaped" (c. 1400).

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Definitions of lingual
1
lingual (adj.)
consisting of or related to language;
lingual diversity
Synonyms: linguistic
lingual (adj.)
pertaining to or resembling or lying near the tongue;
the lingual surface of the teeth
lingual inflammation
2
lingual (n.)
a consonant that is produced with the tongue and other speech organs;
From wordnet.princeton.edu