palm·er·worm /-ˌwɝm/
 毛蟲
 Palm·er·worm n. Zool. (a) 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. (b) 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.
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 Palmer-worm
    (Heb. gazam). The English word may denote either a caterpillar
    (as rendered by the LXX.), which wanders like a palmer or
    pilgrim, or which travels like pilgrims in bands (Joel 1:4;
    2:25), the wingless locusts, or the migratory locust in its
    larva state.