Definition of caddis noun from the Oxford Advanced Learner's Dictionary

 

caddis

 noun
noun
BrE BrE//ˈkædɪs//
 
; NAmE NAmE//ˈkædɪs//
 
(also caddis fly) Invertebrates
 
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a small insect. The young forms, called caddis worms, are often used for catching fish. See related entries: Invertebrates Word Origin mid 17th cent.: of unknown origin.