Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various usually destructive caterpillars that construct webs.

from The Century Dictionary.

  • noun Any one of several lepidopterous larvæ which feed more or less gregariously, and spin large webs into which they retire at night, or within which they feed during the day until the contained foliage is entirely devoured, when the web is enlarged.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) Any one of various species of moths whose gregarious larvæ eat the leaves of trees, and construct a large web to which they retreat when not feeding.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of various caterpillars, mostly of the family Pyralidae, that spin a web.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun several gregarious moth larvae that spin webs over foliage on which they feed

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

web +‎ worm

Examples

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