(lō′kəst) noun
1. Any of a family (Locustidae) of widely distributed orthopterous insects resembling grasshoppers but having short antennae, especially those of migratory habits (Locusta, Pachytylus, Melanoplus, and related genera), which are destructive of grain and vegetation in many parts of the world.
2. A cicada or harvest fly. [<OF locuste <L locusta. Doublet of LOBSTER.]

(lō′kəst) noun
1. A North American tree (Robinia pseudoacacia) of the bean family, with a rough bark, odd–pinnate leaves, and loose, slender racemes of fragrant, white flowers; also, its wood.
2. Any of several other trees with similar pods, as the carob tree.
3. The honey locust. [<NL locusta; orig. applied to the carob pod from its fancied resemblance to the insect]