The Collaborative International Dictionary of English v.0.48:

Convallaria \Con`val*la"ri*a\, n. [NL., from L. convallis a
   valley; con- + vallis valley.] (Bot. & Med.)
   The lily of the valley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Convallaria
    n 1: sometimes placed in family Convallariaceae: lily of the
         valley [syn: Convallaria, genus Convallaria]