/ Dictionary / Index M mud bug: Meaning and Definition of Find definitions for: mud' bug" Pronunciation: [key] a crayfish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mud berth mudcap Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language