/ Dictionary / Index F fasciculus: Meaning and Definition of Find definitions for: fas•cic•u•lus Pronunciation: (fu-sik'yu-lus), [key] — pl. -li a fascicle, as of nerve or muscle fibers. a fascicle of a book. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fasciculus (Thesaurus) fascicule fasciitis Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language