/ Dictionary / Index C coarsen: Meaning and Definition of Find definitions for: coars•en Pronunciation: (kôr'sun, kōr'-), [key] — v.t., v.i. to make or become coarse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coarsen (Thesaurus) coarse-grained coarser Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language