/ Dictionary / Index C coel-: Meaning and Definition of Find definitions for: coel- Pronunciation: [key] a combining form meaning “cavity,” used in the formation of compound words: coelenteron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coefficient of viscosity coelacanth Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language