Easton's Bible Dictionary (Hebrews 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. Noah Webster's Dictionary 1. (n.) 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. 2. (n.) 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. Int. Standard Bible Encyclopedia PALMER-WORM pam'-er-wurm (gazam; Septuagint kampe (Amos 4:9 Joel 1:4; Joel 2:25)): "Palmer-worm" means "caterpillar," but the insect meant is probably a kind of locust. See INSECTS; LOCUST.

Multi-Version Concordance Palmerworm (2 Occurrences) Joel 1:4 That which the palmerworm hath left hath the locust eaten; and that which the locust hath left hath the cankerworm eaten; and that which the cankerworm hath left hath the caterpiller eaten. (KJV) Joel 2:25 And I will restore to you the years that the locust hath eaten, the cankerworm, and the caterpiller, and the palmerworm, my great army which I sent among you. (KJV)