Definition of caddis fly in English English dictionary
any insect, of the order Trichoptera, having two pairs of hairy wings; they are found near lakes and streams
{i} small insect with two pairs of hairy membranous wings and superficially similar to moths
small moth-like insect having two pairs of hairy membranous wings and aquatic larvae
Any of various four-winged insects of the order Trichoptera, found near lakes and streams. Any member of about 7,000 species of mothlike aquatic insects (order Trichoptera) found worldwide, usually in freshwater habitats but sometimes in brackish and tidal waters. Generally dull brownish, caddis flies have long antennae and hairy wings that fold rooflike over the abdomen. They feed primarily on plant juices and flower nectar, though a few are predaceous. Many caddis-fly larvae construct a portable case from grains of sand, bits of shells, and plant debris glued together by a sticky substance they secrete. This case surrounds the larva's abdomen while it matures. Caddis flies are important to freshwater ecosystems because they clean the water by consuming plant and animal debris and serve, as larvae and adults, as an important food for fish, particularly trout