/ Dictionary / Index S sumpter: Meaning and Definition of Find definitions for: sump•ter Pronunciation: (sump'tur), [key] — n. a packhorse or mule. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sumpter (Thesaurus) sumpsimus sumptuary Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language