Boyd’s Bible Dictionary:
(pilgrim-worm). Cankerworm, or caterpillar (Joel 1:4; 2:25; Amos 4:9).
Concise 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; Joel Amos 4:9.
Strong’s Dictionary of Hebrew Words:
Meaning:
from an unused root meaning to devour; a kind of locust