bachelor's buttons
plural noun
treated as sing. or pl.
1- any of a number of ornamental plants which bear small, button-like, double flowers, in particular众多开纽扣状重瓣小花的装饰性植物之一, 尤指：
1.1
- a white flower of the daisy family (Achillea ptarmica, family Compositae).珠蓍（拉丁名Achillea ptarmica,菊科）。
1.2
- a yellow buttercup (Ranunculus acris, family Ranunculaceae).毛茛（拉丁名Ranunculus acris,毛茛科）。