dai·sy 
(dāzē)
(dāzē)n. pl. dai·sies
1. Any of several plants of the composite family, especially:
a. A widely naturalized Eurasian plant (Leucanthemum vulgare syn. Chrysanthemum leucanthemum) having flower heads with a yellow center and white rays. Also called oxeye daisy, white daisy.
b. A low-growing plant (Bellis perennis) native to Europe and widely naturalized, having flower heads with white or pinkish rays. Also called English daisy.
c. The flower head of any of these plants.
2. Slang One that is deemed excellent or notable.
[Middle English daisie, from Old English dæges ēage : dæges, genitive of dæg, day; see agh- in the Appendix of Indo-European roots + ēage, eye; see okw- in the Appendix of Indo-European roots.]