Noun black locust has 2 senses
  1. black locust - strong stiff wood of a black-locust tree; very resistant to decay
    --1 is a kind of
    wood
    --1 is a substance of black locust, yellow locust, Robinia pseudoacacia
  2. black locust, yellow locust, Robinia pseudoacacia - large thorny tree of eastern and central United States having pinnately compound leaves and drooping racemes of white flowers; widely naturalized in many varieties in temperate regions
    --2 is a kind of locust tree, locust
    --2 is a member of Robinia, genus Robinia
    --2 has substances: black locust
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