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: any of an order (Trichoptera) of insects with four membranous usually hairy wings, vestigial mouthparts, slender many-jointed antennae, and aquatic larvae — compare caddisworm
1735, in the meaning defined above
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: an insect that has four wings and a larva which lives in water in a silk case covered especially with bits of wood, gravel, sand, or plant matter
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