Source : Webster's Revised Unabridged Dictionary (1913)

Convallamarin \Con*val"la*ma`rin\, n. [Convallaria + L. amarus
   bitter.] (Chem.)
   A white, crystalline, poisonous substance, regarded as a
   glucoside, extracted from the lily of the valley
   ({Convallaria Majalis}). Its taste is first bitter, then
   sweet.

Source : WordNet®

Convallaria majalis
     n : low-growing perennial plant having usually two large oblong
         lanceolate leaves and a raceme of small fragrant nodding
         bell-shaped flowers followed by scarlet berries [syn: {lily
         of the valley}, {lilies of the valley}, {May lily}]