Pronunciation: (lō'kust),[key] —n. 1. Also called acridid, short-horned grasshopper. any of several grasshoppers of the family Acrididae, having short antennae and commonly migrating in swarms that strip the vegetation from large areas.
2. any of various cicadas, as the seventeen-year locust.
3. any of several North American trees belonging to the genus Robinia, of the legume family, esp. R. pseudoacacia, having pinnate leaves and clusters of fragrant white flowers.
4. the durable wood of this tree.
5. any of various other trees, as the carob and the honey locust.