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From The Collaborative International Dictionary of English v.0.48:
Watermelon \Wa"ter*mel`on\, n. (Bot.) The very large ovoid or roundish fruit of a cucurbitaceous plant (Citrullus vulgaris) of many varieties; also, the plant itself. The fruit sometimes weighs many pounds; its pulp is usually pink in color, and full of a sweet watery juice. It is a native of tropical Africa, but is now cultivated in many countries. See Illust. of Melon. [1913 Webster]