Etymology

idioglossia

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Today it means: An invented form of dialect, language, or speech used by children, typically twins, and intelligible only to its speakers. Full definition →

English idio- ← Ancient Greek ῐ̓́δῐος (ĭ́dĭos) ← Proto-Hellenic *hwédios
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The story

  1. Proto-Indo-European*swé
  2. Proto-Indo-European*swéd-yo-s
  3. Proto-Hellenic*hwédios
  4. Ancient Greekῐ̓́δῐος (ĭ́dĭos)
  5. Englishidio-
  6. English todayidioglossia

From idio- + -glossia.

Etymology from Wiktionary, CC BY-SA 4.0.