a combining form meaning “proper to one,” “peculiar,” used in the formation of compound words: idiomorphic.

< Greek, combining form of ídios (one's) own, personal, private, separate, distinct Unabridged
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World English Dictionary
combining form
indicating peculiarity, isolation, or that which pertains to an individual person or thing: idiolect
[from Greek idios private, separate]

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American Heritage
Medical Dictionary

idio- pref.

  1. One's own; private; personal: idiosyncrasy.

  2. Distinct; separate: idioventricular.

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