What is the meaning of Winter_melon?

Benincasa hispida, a species of the gourd family (Cucurbitaceae) commonly cultivated in Asia.

Any late-maturing variety of true melon (Cucumis melo), such as honeydew melon (Inodorus Group), Cassaba melon (Cassaba Group), and Spanish melon (Ibericus Group).

A type of watermelon (Citrullus lanatus).

Source: wiktionary.org