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The Collaborative International Dictionary
Ypsolophus pometellus

Palmerworm \Palm"er*worm`\, n. (Zo["o]l.)

  1. Any hairy caterpillar which appears in great numbers, devouring herbage, and wandering about like a palmer. The name is applied also to other voracious insects.
    --Joel. i. 4.

  2. In America, the larva of any one of several moths, which destroys the foliage of fruit and forest trees, esp. the larva of Ypsolophus pometellus, which sometimes appears in vast numbers.