n. 1 any of various African and Asian grasshoppers of the family Acrididae, migrating in swarms and destroying vegetation. 2 US a cicada. 3 (in full locust bean) a carob. 4 (in full locust tree) a a carob tree. b = ACACIA 2. c = KOWHAI. locust-bird (or -eater) any of various birds feeding on locusts.
[ ME f. OF locuste f. L locusta lobster, locust ]