/ Dictionary / Index P pressor: Meaning and Definition of Find definitions for: pres•sor Pronunciation: (pres'ur), [key] — adj. Physiol. causing an increase in blood pressure; causing vasoconstriction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pressor (Thesaurus) press of sail pressoreceptor Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language