Watermelon n. : 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.

Example:


Taxonomy
watermelon, fruit, melons, seeds, varieties, plant, flesh, Seedless watermelon, seedless fruit, Pickled watermelon rind, dưa, watermelon seeds, harvest, Citrullus lanatus, seedless watermelon seeds, hive, seedless, 07-15.

Defination from the web:
Watermelon (Citrullus lanatus (Thunb.) Matsum & Nakai, family Cucurbitaceae) refers to both fruit and plant of a vine-like (scrambler and trailer) ... The watermelon fruit, loosely considered a type of melon (although not in the genus Cucumis), has a smooth exterior rind (green, yellow, and ...