| Noun | 1. | Citrullus vulgaris - an African melon watermelon - large oblong or roundish melon with a hard green rind and sweet watery red or occasionally yellowish pulp Citrullus, genus Citrullus - a dicot genus of the family Cucurbitaceae including watermelons melon vine, melon - any of various fruit of cucurbitaceous vines including: muskmelons; watermelons; cantaloupes; cucumbers |