lin·gual (l?ng?gw?l)adj.1. Of, relating to, or situated near the tongue or a tonguelike organ.2. Linguistics Pronounced with the tongue in conjunction with other organs of speech.3. Of languages; linguistic: lingual diversity.n. Linguistics A sound, such as (t), (l), and (n), that is pronounced with the tongue and other organs of speech.lin?gual·ly adv.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.lingual (?l???w?l) adj1. (Anatomy) anatomy of or relating to the tongue or a part or structure resembling a tongue2. (Linguistics) a. rare of or relating to language or languagesb. (in combination): polylingual. 3. (Phonetics & Phonology) articulated with the tonguen (Phonetics & Phonology) a lingual consonant, such as Scots (r) ?lingually advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014lin?gual (?l?? gw?l) adj. 1. of or pertaining to the tongue or some tonguelike part. 2. pertaining to languages. 3. articulated with the aid of the tongue, esp. the tip of the tongue, as the sound (d) or (n). n. 4. a lingual speech sound. [1350?1400; Middle English: tongue-shaped surgical instrument