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any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America

any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America

[Gr.] (Bot.) A small gen. of plants, natives of Mexico, ord, Papaveraceae. A. mexicana has seeds narcotic, purgative, diuretic, and yielding a valuable oil to painters. It is often a noxious weed in the tropics.