The Collaborative International Dictionary of English v.0.48:

Nelumbo \Ne*lum"bo\, prop. n. [Ceylonese word.] (Bot.)
   A genus of great water lilies. The North American species is
   Nelumbo lutea, the Asiatic is the sacred lotus, Nelumbo
   speciosa. [Written also Nelumbium.]
   [1913 Webster]