any moth of the family Psychidae in its caterpillar phase, in which it wraps itself in a bag of silk, leaves, etc.

1860–65, Americanism; bag + worm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bagworm (ˈbæɡˌwɜːm)
1.  the larva of moths of the family Psychidae, which forms a protective case of silk covered with grass, leaves, etc
2.  bagworm moth any moth of the family Psychidae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Often times, the bagworm will go unnoticed until the foliage used in the bag turns brown.
If the bag material is constructed in a vertical pattern the bag is that of an evergreen bagworm.
Winter is a great time to reduce the bagworm population, decreasing damage next summer.
Bagworm caterpillars occasionally web foliage and debris together to make bags up to two inches long.
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