- any of numerous aquatic insects constituting the order Trichoptera, having two pairs of membranous, often hairy wings and superficially resembling moths.
Origin of caddisfly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for caddisfly
After a while he will cling to some weed near the surface, and spin a chrysalis, from which the caddisfly will break forth.