Rafflesia \Raf*fle"si*a\, n. [NL. Named from its discoverer, Sir S. Raffle?.] (Bot.) A genus of stemless, leafless plants, living parasitically upon the roots and stems of grapevines in Malaysia. The flowers have a carrionlike odor, and are very large, in one species ({Rafflesia Arnoldi}) having a diameter of two or three feet.