Cacao \Ca*ca"o\, n. [Sp., fr. Mex. kakahuatl. Cf. Cocoa, Chocolate] (Bot.) A small evergreen tree (Theobroma Cacao) of South America and the West Indies. Its fruit contains an edible pulp, inclosing seeds about the size of an almond, from which cocoa, chocolate, and broma are prepared.

Source: Webster's Revised Unabridged Dictionary (1913)