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a combining form meaning “proper to one,” “peculiar,” used in the formation of compound words:
Origin of idio-
< Greek, combining form of ídios (one's) own, personal, private, separate, distinct Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for idio-


combining form
indicating peculiarity, isolation, or that which pertains to an individual person or thing: idiolect
Word Origin
from Greek idios private, separate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for idio-

word-forming element meaning "one's own, personal, distinct," from Greek idio-, comb. form of idios "own, personal, private, one's own" (see idiom).

Online Etymology Dictionary, © 2010 Douglas Harper
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idio- in Medicine

idio- pref.

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

  2. Distinct; separate: idioventricular.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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