bitter melon

Short definition from Wiktionary

Noun

1. 1
   A vine, Momordica charantia, which produces a bitter yet edible fruit.
2. 2
   The fruit of the bitter melon vine.
3. 3
   The colocynth, Citrullus colocynthis.
4. 4
   A similar fruit-bearing vine, Citrullus lanatus (Citroides Group).