any widely cultivated Eurasian liliaceous plant of the genus Hemerocallis, having large yellow, orange, or red lily-like flowers, which typically last for only one day and are immediately succeeded by others
2.
the flower of any of these plants
day lily in American English
1.
any of a genus (Hemerocallis) of plants of the lily family, with showy, trumpet-shaped flowers, usually opening for a single day