Noun day lily has 2 senses
- plantain lily, day lily - any of numerous perennials having mounds of sumptuous broad ribbed leaves and clusters of white, blue, or lilac flowers; used as ground cover
--1 is a kind of herb, herbaceous plant
--1 is a member of Hosta, genus Hosta, Funka, genus Funka
- day lily, daylily - any of numerous perennials having tuberous roots and long narrow bladelike leaves and usually yellow lilylike flowers that bloom for only a day
--2 is a kind of liliaceous plant
--2 is a member of Hemerocallis, genus Hemerocallis
--2 has particulars: lemon lily, Hemerocallis lilio-asphodelus, Hemerocallis flava
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