Definition of Caddis:

part of speech: noun

A kind of worsted lace or ribbon.

Usage examples:

• It put us in mind of the caddis worms which we had seen in ponds in England. W.H.G. Kingston in "On the Banks of the Amazon".

• A hard winter doubtless commits sad havoc among the caddis and larvae at the bottom of the river; the trout, not being able to get much fly, are then compelled to fall back on the crustaceans. J. Arthur Gibbs in "A Cotswold Village".