Noah Webster's Dictionary 1. (n.) The larva of a caddice fly. These larvae generally live in cylindrical cases, open at each end, and covered externally with pieces of broken shells, gravel, bits of wood, etc. They are a favorite bait with anglers. Called also caddice worm, or caddis worm. 2. (n.) A kind of worsted lace or ribbon. Int. Standard Bible Encyclopedia CADDIS kad'-is. See GADDIS.