The Collaborative International Dictionary of English v.0.48:
caddis fly \caddis fly\, caddisfly \caddisfly\n. same as caddice fly. Syn: caddice fly, caddicefly. [WordNet 1.5]WordNet (r) 3.0 (2006):
caddis-fly n 1: small moth-like insect having two pairs of hairy membranous wings and aquatic larvae [syn: caddis fly, caddis-fly, caddice fly, caddice-fly]