/ Dictionary / Index C clemastine fumarate: Meaning and Definition of Find definitions for: clem•a•stine fu•ma•rate Pronunciation: (klem'u-stēn" fy'mu-rāt"), [key] — Pharm. Pharm. an antihistamine, CHClNO, that has drying and some sedative effects, used for symptomatic relief of allergy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. clem clematis Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language