What is "bitter melon"

alt. 1 A vine, (taxlink Momordica charantia species noshow=1), which produces a bitter, though edible, fruit. 2 The fruit of the bitter melon vine. 3 (cx Australia English) (taxlink Citrullus lanatus Citroides Group cultivar group noshow=1) n. 1 A vine, (taxlink Momordica charantia species noshow=1), which produces a bitter, though edible, fruit. 2 The fruit of the bitter melon vine. 3 (cx Australia English) (taxlink Citrullus lanatus Citroides Group cultivar group noshow=1)