Citrul'lus Citrullus (vulgaris) -- Cucurbita (Cu'cumis) Citrullus, Watermelon Seed. -- S. Asia; cultivated. Fruit edible, very large; seed flat, ovate, 12 Mm (1/2') long, blackish, marbled, or orange-brown, ungrooved, blunt on the edge, otherwise like pumpkin seed. Kernels contain fixed oil 7.4 p.c., petroleum benzin extract 19 p.c., proteins, sugar, resin (cucurbitol--closely related to grindelol and ipurganol); diuretic, tenifuge, anthelmintic. Dose, 3id-16 (8-60 Gm.)