/ Dictionary / Index V voluntary muscle: Meaning and Definition of Find definitions for: vol'untary mus'cle Pronunciation: [key] — Anat. Anat. muscle whose action is normally controlled by an individual's will; mainly skeletal muscle, composed of parallel bundles of striated, multinucleate fibers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. voluntaryism volunteer Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language