Definitions

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

  • noun The larva of either of two geometrid moths (Paleacrita vernata or Alsophila pometaria), destructive to fruit and shade trees.

from The Century Dictionary.

  • noun A name given to certain caterpillars which are very destructive to fruit- and shade-trees.

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

  • noun (Zoöl.) The larva of two species of geometrid moths which are very injurious to fruit and shade trees by eating, and often entirely destroying, the foliage. Other similar larvæ are also called cankerworms.

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

  • noun Either of two caterpillars, the larvae of geometrid moths, that are destructive to fruit, buds and leaves.
  • noun figuratively A corrupting or destructive force.

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

  • noun green caterpillar of a geometrid moth; pest of various fruit and shade trees

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From canker +‎ worm.

Examples

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