/ Dictionary / Index C caddisfly: Meaning and Definition of Find definitions for: cad•dis•fly Pronunciation: (kad'is-flī"), [key] — pl. -flies. any of numerous aquatic insects constituting the order Trichoptera, having two pairs of membranous, often hairy wings and superficially resembling moths. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. caddis caddish Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language