idio-

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

combining form

1. indicating peculiarity, isolation, or that which pertains to an individual person or thingidiolect

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

pref.

1. One’s own; private; personal:idiosyncrasy.
2. Distinct; separate:idioventricular.