Easton's Bible Dictionary (1897)
(Heb. gazam). ), 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.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
PALM'ER-WORM, a destructive insect of the locust tribe, figuratively spoken of in Joel 1:4; Am 4:9 as an instrument employed to afflict the rebellious Jews. See Locust.