locust tree

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A large North American tree of the genus Robinia (Robinia Pseudacacia), producing large slender racemes of white, fragrant, papilionaceous flowers, and often cultivated as an ornamental tree. In England it is called acacia.
• noun (Bot.) a tree of the genus Gleditschia ) Gleditschia 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.
• noun (Bot.) a small swamp tree (Gleditschia monosperma), of the Southern United States.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of a number of trees in the genera Gleditsia and Robinia.
• noun The honey locust, a leguminous tree with pods having a sweet, edible pulp.
• noun The black locust, a leguminous tree with toxic pods, but useful for making honey.
• noun less common The African locust bean tree (Parkia biglobosa).
• noun The carob tree, Ceratonia siliqua.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various hardwood trees of the family Leguminosae