Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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