Also found in: Medical.
Related to caddis worm: trichopterans
cad·dis·wormor caddis worm (kăd′ĭs-wûrm′)
The aquatic wormlike larva of a caddisfly, enclosed in a cylindrical case covered with grains of sand, bits of wood or shell, or other debris.
caddis wormor caddis
1. (Animals) the aquatic larva of a caddis fly, which constructs a protective case around itself made of silk, sand, stones, etc. Also called: caseworm or strawworm