[lo.cust] n [ME, fr. L locusta] (14c) 1: short-horned grasshopper; esp: a migratory grasshopper often traveling in vast swarms and stripping the areas passed of all vegetation
2: cicada 3 a: any of various leguminous trees: as (1): carob 1 (2): black locust (3): honey locust b: the wood of a locust tree