Reference: Palmer-worm
American
This old English term, meaning pilgrim-worm, is used in Jer 1:4; 2:25; Am 4:9, like "canker-worm" and "caterpillar," for the locust in one of another of its various species or transitions. These insects are very destructive even before they reach the winged state. See LOCUST.
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Easton
(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 (Joe 1:4; 2:25), the wingless locusts, or the migratory locust in its larva state.
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Hastings
Old Eng. for 'caterpillar,' see Locust.
Morish
The word is gazam, from a root signifying 'to cut off,' and is supposed to refer to some species of caterpillar, but to which is unknown. The devastations it causes are mentioned in Joe 1:4; 2:25; Am 4:9.