The Collaborative International Dictionary of English v.0.48:

Nenuphar \Nen"u*phar\ (n[e^]n"[-u]*f[aum]r), n. [F. n['e]nufar:
   cf. Sp. nen['u]far, It. nenuf['a]r; all fr. Per.
   n[imac]l[=u]far.] (Bot.)
   The great white water lily of Europe; the Nymphaea alba.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Nymphaea alba
    n 1: a water lily with white flowers [syn: European white
         lily, Nymphaea alba]