- any of several grasshoppers of the family Acrididae, having short antennae and commonly migrating in swarms that strip the vegetation from large areas.
- any of various cicadas, as the seventeen-year locust.
- any of several North American trees belonging to the genus Robinia, of the legume family, especially R. pseudoacacia, having pinnate leaves and clusters of fragrant white flowers.
- the durable wood of this tree.
- any of various other trees, as the carob and the honey locust.
- any of numerous orthopterous insects of the genera Locusta, Melanoplus, etc, such as L. migratoria, of warm and tropical regions of the Old World, which travel in vast swarms, stripping large areas of vegetation
- a North American leguminous tree, Robinia pseudoacacia, having prickly branches, hanging clusters of white fragrant flowers, and reddish-brown seed pods
- the yellowish durable wood of this tree
- any of several similar trees, such as the honey locust and carob
