• Webster's Revised Unabridged Dictionary
    • n Bagworm (Zoöl) One of several lepidopterous insects which construct, in the larval state, a baglike case which they carry about for protection. One species (Platœceticus Gloveri) feeds on the orange tree. See Basket worm.
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Century Dictionary and Cyclopedia
    • n bagworm The larva of a lepidopterous insect, Thyridopteryx ephemeræ-formis (Harris), common throughout the more northern part of the United States. The larva is called bag-worm because it spins a silken bag for its protection, and moves with it hanging downward; it has also received the names basket-worm, drop-worm, etc. The male insect has well-developed wings, but the female is apterous, and lays her eggs within the puparium.
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In literature:

My trees are troubled with tent-caterpillar, bagworm and roundhead borer.
"The Apple" by Various

In news:

Bagworms have been munching on the needles for weeks and we wonder how it all happened.
Well, they are at work right now so go outside and take inventory of your evergreens because that's what the bagworm likes the most.
Bagworms can easily be recognized by their cocoonlike cases, which are carried about by the larvae as they feed.
Each larva constructs its bag of silk and bits of leaves and twigs cut from the host plant, so a bagworm 's appearance will vary from plant to plant.
Although bagworms can be found feeding on black locust.
My husband noticed some bagworm cases attached high up on the side of our house.