day lil·y, day·lil·y Bot. (a) any plant of a genus of plants (Hemerocallis) closely resembling true lilies, but having tuberous rootstocks instead of bulbs. The common species have long narrow leaves and either yellow or tawny-orange flowers, which often bloom for only one day. (b) A genus of plants (Funkia) differing from the last in having ovate veiny leaves, and large white or blue flowers.
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day lily
n 1: any of numerous perennials having mounds of sumptuous broad
ribbed leaves and clusters of white, blue, or lilac
flowers; used as ground cover [syn: plantain lily]
2: any of numerous perennials having tuberous roots and long
narrow bladelike leaves and usually yellow lilylike
flowers that bloom for only a day [syn: daylily]