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idioglossia

[id-ee-uh-glos-ee-uh, -glaw-see-uh] /ˌɪd i əˈglɒs i ə, -ˈglɔ si ə/
noun
1.
a private form of speech invented by one child or by children who are in close contact, as twins.
2.
a pathological condition characterized by speech so distorted as to be unintelligible.
Origin
1890-1895
1890-95; < Greek idióglōss(os) of distinct or peculiar tongue (idio- idio- + -glōssos, adj. derivative of glôssa tongue) + -ia -ia
Related forms
idioglottic
[id-ee-uh-glot-ik] /ˌɪd i əˈglɒt ɪk/ (Show IPA),
adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for idioglossia

idioglossia

/ˌɪdɪəʊˈɡlɒsɪə/
noun
1.
a private language, as invented by a child or between two children, esp twins
2.
a pathological condition in which a person's speech is so severely distorted that it is unintelligible
Word Origin
C19: from Greek idios private, separate + glossa tongue
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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