/ Dictionary / Index K knuckle joint: Meaning and Definition of Find definitions for: knuck'le joint" Pronunciation: [key] a joint forming a knuckle. a joint between two parts allowing movement in one plane only. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. knucklehead knuckle sandwich Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language