/ Dictionary / Index C collar button: Meaning and Definition of Find definitions for: col'lar but"ton Pronunciation: [key] a button or stud for fastening a detachable collar to the neckband of a shirt or for fastening together the ends of a collar or neckband. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. collarbone collar cell Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language