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caseworm

[keys-wurm] /ˈkeɪsˌwɜrm/
noun
1.
a caddisworm or other insect larva that constructs a case around its body.
Origin
1600-1610
1600-10; case2 + worm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for caseworm

caseworm

/ˈkeɪsˌwɜːm/
noun
1.
another name for a caddis worm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for caseworm

15
17
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