/ Dictionary / Index R rigor mortis: Meaning and Definition of Find definitions for: rig•or mor•tis Pronunciation: (rig'ur môr'tis, or, esp. Brit., rī'gôr), [key] the stiffening of the body after death. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rigorism rigorous Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language