Bible Dictionary · P
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; Joel 2:25), the wingless locusts, or the migratory locust in its larva state.
From Easton’s Bible Dictionary (1897), by Matthew George Easton.