\Lo"cust tree`\ [Etymol. uncertain.] (Bot.)
A large North American tree of the genus {Robinia} ({R.
Pseudacacia}), producing large slender racemes of white,
fragrant, papilionaceous flowers, and often cultivated as an
ornamental tree. In England it is called {acacia}.
Note: The name is also applied to other trees of different
      genera, especially to those of the genus {Hymen[ae]a},
      of which {H. Courbaril} is a lofty, spreading tree of
      South America; also to the carob tree ({Ceratonia
      siliqua}), a tree growing in the Mediterranean region.
{Honey locust tree} (Bot.), a tree of the genus {Gleditschia}
   ) {G. triacanthus}), having pinnate leaves and strong
   branching thorns; -- so called from a sweet pulp found
   between the seeds in the pods. Called also simply {honey
   locust}.
{Water locust tree} (Bot.), a small swamp tree ({Gleditschia
   monosperma}), of the Southern United States.