linguo-, lingu-, lingua-, -linguist, -linguistic, -linguistical, -linguistically +

(Latin: literally tongue; and by extension, speech, language)

From Old Latin dingua which is a cognate (kindred) with Old English tunge, The change of d (in Old Latin dingua) to l (in Latin lingua) was probably due to dialectal influence (the so-called "Sabine l"). It was facilitated by a folk-etymological association with lingere, "to lick", the tongue having been conceived as "the licking organ".

—According to Dr. Ernest Klein in his
A Comprehensive Etymological Dictionary of the English Language
retrolingual
1. Situated behind or near the base of the tongue; such as, retrolingual salivary glands.
2. Relating to the back part of the tongue; posterior to the tongue.
sesquilingual
1. The difference between being monolingual and bilingual.
2. A situation in which people know one language and part ("half"?) of another one.
—Coined by William Sherk as seen in his "Introduction" to 500 Years of New Words;
Doubleday Canada Limited, Toronto, Canada; 1983.
sesquilinguist
Someone who knows one and "a half" languages (or one and "part" of another language).
sociolinguistic
1. Of or relating to the social aspects of language.
2. Of or relating to sociolinguistics.
3. The study of language and linguistic behavior as influenced by social and cultural factors.
sociolinguistically
A reference to the study of language in relation to its sociocultural context.
sociolinguistics
The study of the relationships between language and social and cultural factors.
sublingua
In anatomy, a process or fold below the tongue in some animals.
sublingual
1. Situated beneath or on the underside of the tongue.
2. A sublingual part, such as a gland, artery, or duct.
3. Placed under the tongue; a reference to medicines that are administered by being placed under the tongue to dissolve.
sublingual ulcer
An ulcer on the floor of the mouth, the ventral surface of the tongue, or the frenum (restraining structure) of the tongue.
tongue or language

The word "language" literally comes from a Latin word lingua which means "tongue". The Greek stem is glosso- and glotto- which stand for both "language" and "tongue".

Language is used in several thousand forms and dialects expressing all kinds of views, literatures, and ways of life. If we look to the past, we can only see as far back as language lets us see it. As we look to the future, we can only plan through the means of language.

Etymology: Old English tunge, "organ of speech, speech, language"; from Proto-Germanic (a hypothetical prehistoric ancestor of all Germanic languages, including English) tungon, Old High German zunga; German Zunge; comparable to Latin lingua, "tongue, speech, language"; from Old Latin dingua.

trilingual
Speaking or using, written or expressed in, or relating to three languages.
unilingual
Making use of or written in only one language; such as a unilingual book.
vermilingual
Having a long wormlike tongue.
Vermilinguia
1. A tribe of edentates comprising the South American ant-eaters. The tongue is long, slender, exsertile, and very flexible, whence the name.
2. A tribe of Old World lizards which comprises the chameleon. They have long, flexible tongues.
Cross references of word families related directly, or indirectly, to: "talk, speak, speech; words, language; tongue, etc.": cit-; clam-; dic-; fa-; -farious; glosso-; glotto-; lalo-; locu-; logo-; loqu-; mythico-; -ology; ora-; -phasia; -phemia; phon-; phras-; Quotes: Language,Part 1; Quotes: Language, Part 2; Quotes: Language, Part 3; serm-; tongue; voc-.