The Collaborative International Dictionary of English v.0.48:
Citrullus \Citrullus\ n. a genus of vines including the watermelons (Citrullus lanata). Syn: genus Citrullus. [WordNet 1.5]WordNet (r) 3.0 (2006):
Citrullus n 1: a dicot genus of the family Cucurbitaceae including watermelons [syn: Citrullus, genus Citrullus]