- lily [lil′ē]n.pl. lilies [ME lilie < OE < L lilium]1. any of a large genus (Lilium) of perennial plants of the lily family, grown from a bulb and having typically trumpet-shaped flowers, white or colored2. the flower or the bulb of any of these plants3. any of several plants similar to the true lily, as the waterlily4. the flower of any of these plants5. the heraldic fleur-de-lis, as in the royal arms of Franceadj.1. designating a family (Liliaceae, order Liliales) of monocotyledonous, usually herbaceous, plants, including the tulips, hyacinths, onions, and asparagus2. like a lily, as in whiteness, delicacy, purity, etc.——————gild the lilyto attempt vain improvements on something that is already excellent or perfect
English World dictionary. V. Neufeldt. 2014.