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idioglossia

[id-ee-uh-glos-ee-uh, -glaw-see-uh]
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.
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Origin of idioglossia

1890–95; < Greek idióglōss(os) of distinct or peculiar tongue (idio- idio- + -glōssos, adj. derivative of glôssa tongue) + -ia -ia
Related formsid·i·o·glot·tic [id-ee-uh-glot-ik] /ˌɪd i əˈglɒt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for idioglossia

idioglossia

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
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012