The Collaborative International Dictionary of English v.0.48:

Rafflesia \Raf*fle"si*a\ (r[a^]f*fl[=e]"zh[i^]*[.a]), n. [NL.
   Named from its discoverer, Sir S. Raffles.] (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.
   [1913 Webster]