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Definition of locust
- 1a large and mainly tropical grasshopper with strong powers of flight. It is usually solitary, but from time to time there is a population explosion, and it migrates in vast swarms that cause extensive damage to crops.
- Several species in the family Acrididae, including the migratory locust (Locusta migratoria), which is sometimes seen in Europe
Middle English: via Old French locuste from Latin locusta 'locust, crustacean'