idioglossia
noun
1 Medicine a form of dyslalia characterized by consistent substitution of speech sounds to such a degree that the affected person seems to speaking a language of his or her own.
2(More generally) a personal, private, or invented language.
Origin
Late 19th century. From idio- + -glossia, perhaps after Hellenistic Greek ἰδιόγλωσσος of distinct tongue.
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