noun
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the trailing vine Citrullus vulgaris of Cucurbitaceae family, water melon plant.
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its large, round or oblong, edible fruit with a hard, green rind and sweet, juicy, pink or red pulp containing many seeds; water melon.
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the perennial vine Citrullus colocynthis ( = Cucumis colocynthis) of Cucurbitaceae family; colocynth.
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its small, bitter fruit used in making a strong cathartic; colocynth.