winter melon

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A tendril-bearing, sprawling annual plant (Benincasa hispida) widely cultivated in tropical and subtropical Asia for its waxy-skinned edible fruit.
• noun The fruit of this plant, often cooked as a vegetable or boiled and sweetened as a confection.
• noun Any of several varieties of melon (Cucumis melo) usually having a smooth hard rind and including the honeydew melon and the crenshaw.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A vine of the genus Benincasa cultivated throughout Asia.
• noun A green, fuzzy melon fruit taken from this vine that has sweet white flesh.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of a variety of muskmelon vines having fruit with a smooth white rind and white or greenish flesh that does not have a musky smell
• noun the fruit of the winter melon vine; a green melon with pale green to orange flesh that keeps well