Morrish Bible Dictionary
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 Joel 1:4; Joel 2:25; Amos 4:9 .
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Morrish, George. Entry for 'Palmer-Worm'. Morrish Bible Dictionary. https://www.studylight.org/dictionaries/eng/mbd/p/palmer-worm.html. 1897.