watermelon

n. large vine-grown fruit that has a tough green rind and sweet juicy reddish flesh; vine on which watermelons are grown

Watermelon (Citrullus lanatus (Thunb.) Matsum & Nakai, family Cucurbitaceae) refers to both fruit and plant of a vine-like (climber and trailer) herb originally from southern Africa and one of the most common types of melon. This flowering plant produces a special type of fruit known by botanists as a pepo, which has a thick rind (exocarp) and fleshy center (mesocarp and endocarp); pepos are derived from an inferior ovary and are characteristic of the Cucurbitaceae. The watermelon fruit, loosely considered a type of melon (although not in the genus Cucumis), has a smooth exterior rind (green and yellow) and a juicy, sweet, usually red or yellow, but sometimes orange, interior flesh. The flesh consists of highly developed placental tissue within the fruit. The former name Citrullus vulgaris (vulgaris meaning "common" — Shosteck, 1974), is now a synonym of the accepted scientific name for watermelon, Citrullus lanatus.
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Noun
1. an African melon
(synonym) watermelon vine, Citrullus vulgaris
(hypernym) melon, melon vine
(member-holonym) Citrullus, genus Citrullus
2. large oblong or roundish melon with a hard green rind and sweet watery red or occasionally yellowish pulp
(hypernym) melon
(part-holonym) watermelon vine, Citrullus vulgaris

(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.
  

Amount per 100g:
• Calories.......................32
• Total Fat......................0 g
• Saturated Fat.................0 g
• Cholesterol..................0 mg
• Sodium........................2 mg
• Total Carbohydrate......7 g
• Dietary Fiber...................1 g
• Protein.........................1 g Vitamin A  366 IU   Vitamin C  10 mg
 Calcium    8 mg    Iron         0 mg