/ Dictionary / Index C coronary cushion: Meaning and Definition of Find definitions for: cor'onary cush'ion Pronunciation: [key] a thick band of vascular tissue in the coronet of horses and other hoofed animals that secretes the horny wall of the hoof. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coronary-care unit coronary insufficiency Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language