Dictionary![]() ![]() sour' gum"a tree, Nyssa sylvatica, of eastern North America, having elliptic leaves, dark-blue, berrylike fruit, and wood with a variety of commercial uses. Also called black gum, beetlebung, pepperidge. Cf. tupelo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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