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From The Collaborative International Dictionary of English v.0.48:
Daisy \Dai"sy\ (d[=a]"z[y^]), n.; pl. Daisies (d[=a]"z[i^]z). [OE. dayesye, AS. d[ae]ges-e['a]ge day's eye, daisy. See Day, and Eye.] (Bot.) (a) A genus of low herbs (Bellis), belonging to the family Composit[ae]. The common English and classical daisy is Bellis perennis, which has a yellow disk and white or pinkish rays. (b) The whiteweed (Chrysanthemum Leucanthemum), the plant commonly called daisy in North America; -- called also oxeye daisy. See Whiteweed. [1913 Webster] Note: The word daisy is also used for composite plants of other genera, as Erigeron, or fleabane. [1913 Webster] Michaelmas daisy (Bot.), any plant of the genus Aster, of which there are many species. Oxeye daisy (Bot.), the whiteweed. See Daisy (b) . [1913 Webster] daisybush