cola nut(n = noun.plant) kola nut - bitter brown seed containing caffein; source of cola extract;
is a kind of nut
is a part of cola acuminata, goora nut, kola, kola nut, kola nut tree

   The bitter fruit of Cola acuminata, which is nearly as large as a chestnut, and furnishes a stimulant, which is used in medicine. [Webster 1913 Suppl.]

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