/ Dictionary / Index M mudder: Meaning and Definition of Find definitions for: mud•der Pronunciation: (mud'ur), [key] — n. a racehorse able to perform well on a wet, muddy track. an athlete who performs well in muddy conditions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mudder (Thesaurus) mud dauber muddle Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language