/ Dictionary / Index P promethazine: Meaning and Definition of Find definitions for: pro•meth•a•zine Pronunciation: (prō-meth'u-zēn", -zin), [key] — n. Pharm. a phenothiaxine derivative, CHNS, used for the symptomatic relief of allergies and in the management of motion sickness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: promethazine (Thesaurus) promenade tile Promethea moth Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language