The Collaborative International Dictionary
Water locust
Water locust \Wa"ter lo"cust\ (Bot.) A thorny leguminous tree ( Gleditschia monosperma) which grows in the swamps of the Mississippi valley.
Wiktionary
water locust
n. (taxlink Gleditsia aquatica species noshow=1), a tree found in swamps.
WordNet
water locust
n. honey locust of swamps and bottomlands of southern United States having short oval pods; yields dark heavy wood [syn: swamp locust, Gleditsia aquatica]