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.