/ Dictionary / Index M musclebound: Meaning and Definition of Find definitions for: mus•cle•bound Pronunciation: (mus'ul-bound"), [key] — adj. having enlarged and inelastic muscles, as from excessive exercise. rigid; inflexible: musclebound rules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. muscle beach muscle fiber Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language