Source : Webster's Revised Unabridged Dictionary (1913)

Hemerocallis \Hem`e*ro*cal"lis\, n. [NL., fr. Gr. ?; ? day + ?
   beauty.] (Bot.)
   A genus of plants, some species of which are cultivated for
   their beautiful flowers; day lily.

Source : WordNet®

Hemerocallis
     n : east Asian rhizomatous clump-forming perennial herbs having
         flowers on long leafless stalks; cosmopolitan in
         cultivation: day lilies; sometimes placed in subfamily
         Hemerocallidaceae [syn: {genus Hemerocallis}]