(Zool.), a small mothlike species of trichopterous insect, whose larva is the caddice; it has two pairs of hairy membranous wings and aquatic larvae. [ 1913 Webster + WordNet 1.5 ]
n.
Every Scotchman, from the peer to the cadie. Macaulay. [ 1913 Webster ]
n. [ OE. caddas, Scot. caddis lint, caddes a kind of woolen cloth, cf. Gael. cada, cadadh, a kind of cloth, cotton, fustian, W. cadas, F. cadis. ] A kind of worsted lace or ribbon. “Caddises, cambrics, lawns.” Shak. [ 1913 Webster ]
a. Like a cad; lowbred and presuming. [ 1913 Webster ]