Daisy, any of several species of flowering plants belonging to the aster family (asteraceae).Daisies are distinguished by a composite flower head composed of 15 to 30 white ray flowers surrounding a …The meaning of daisy is a composite plant (as of the genera bellis or chrysanthemum) having a flower head with well-developed ray flowers usually arranged in one or a few whorls.Daisy is the common name for a large number of dicotyledonous flowering plants within the asteraceae (or composite) family, and in particular is associated with the true, common, or english daisy (bellis …