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caddis

noun
🔊/ˈkædɪs/
🔊/ˈkædɪs/
(also caddis fly)
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  1. a small insect. The young forms, called caddis worms, are often used for catching fish.石蛾（幼虫常用作鱼饵）Topics Insects, worms, etc.c2
    Word Originmid 17th cent.: of unknown origin.