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There are 5 twelve-letter words beginning with IDIO

IDIOGLOSSIASidioglossias n. Plural of idioglossia.
IDIOGLOSSIA n. secret speech or language, esp. invented by children.
IDIOMORPHISMIDIOMORPHISM n. the state of being idiomorphic.
IDIORHYTHMICidiorhythmic adj. Having its own rhythm or style.
IDIORHYTHMIC adj. self-regulating; allowing each member to regulate his or her own life, also IDIORRHYTHMIC.
IDIOSYNCRASYidiosyncrasy n. A behavior or way of thinking that is characteristic of a person.
idiosyncrasy n. A language or behaviour that is particular to an individual or group.
idiosyncrasy n. (Medicine) A peculiar individual reaction to a generally innocuous substance or factor.
IDIOTHERMOUSIDIOTHERMOUS adj. warm-blooded.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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