Locust-tree meaning

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

  • Named after the "locusts" said to have been eaten by John the Baptist, based on the theory that they were really carob pods.
    From Wiktionary