/ Dictionary / Index S stressor: Meaning and Definition of Find definitions for: stres•sor Pronunciation: (stres'ur, -ôr), [key] — n. an activity, event, or other stimulus that causes stress. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: stressor (Thesaurus) stress mark stress test Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language