/ Dictionary / Index C cleidoic: Meaning and Definition of Find definitions for: clei•do•ic Pronunciation: (klī-dō'ik), [key] — adj. Embryol. isolated from the environment, as certain eggs enclosed within a shell or membrane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cleft sentence Cleisthenes Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language