Noun black gum has 2 senses
  1. sour gum, black gum, pepperidge, Nyssa sylvatica - columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall
    --1 is a kind of tupelo, tupelo tree
  2. black mallee, black sally, black gum, Eucalytus stellulata - small mallee with rough dark-colored bark toward the butt yielding a red eucalyptus kino
    --2 is a kind of mallee
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