Definitions for black gum
Random House Webster's College Dictionary
Ref: sour gum.
sour gum, black gum, pepperidge, Nyssa sylvatica(noun)
columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall
black mallee, black sally, black gum, Eucalytus stellulata(noun)
a small mallee with rough dark-colored bark toward the butt; yields a red eucalyptus kino gum
A tree native to eastern North America, .