'daylily' definitions:

Definition of '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 [syn: day lily, daylily]

Definition of 'daylily'

From: GCIDE

day lily \day" lil`y\, daylily \day"lil`y\(l[i^]l`[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. [1913 Webster +PJC]