Definitions for daylily
Random House Webster's College Dictionary
or day′ lil′y
any lily of the genus Hemerocallis, having short-lived yellow, orange, or red flowers.
Origin of daylily:
day lily, daylily(noun)
any of numerous perennials having tuberous roots and long narrow bladelike leaves and usually yellow lily-like flowers that bloom for only a day
Any of several perennial plants, of the genus Hemerocallis, that have fleshy roots, grasslike leaves and colourful flowers that bloom for just one day.