(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
‖n. [ NL., fr. Gr. &unr_;; &unr_; day + ka`llos beauty. ] (Bot.) A genus of plants, some species of which are cultivated for their beautiful flowers; day lily. [ 1913 Webster ]