What is the meaning of Locust?

Any of the grasshoppers, often polyphenic and usually swarming, in the family Acrididae that are very destructive to crops and other vegetation, especially migratory locusts (Locusta migratoria).

A fruit or pod of a carob tree .

Any of various often leguminous trees and shrubs, especially of the genera Robinia and Gleditsia; locust tree.

A cicada.

A mainlander.

A dose of laudanum.

To come in a swarm.

alternative form of locuste

Source: wiktionary.org