caddis (Noun) — Larva of the caddis fly; constructs a case of silk covered with sand or plant debris.
caddis (Noun) — Small moth-like insect having two pairs of hairy membranous wings and aquatic larvae.
caddis (Noun) — The larva of a caddice fly that generally live in cylindrical cases, open at each end, and covered externally with debris.
caddis (Noun) — A kind of worsted lace or ribbon.