Definition of blue daisy in English:

blue daisy

noun

  • Any of several plants of the families Asteraceae (Compositae) and Plantaginaceae, having blue, somewhat daisy-like, flowers; especially blue marguerite, Felicia amelloides, and sea aster, Aster tripolium.

Origin

Late 16th century; earliest use found in John Gerard (c1545–1612), herbalist.