trefoil arch

英 美
  • 三心花瓣拱,三叶拱
  • arch n.拱;拱门;拱状物v.成拱形;拱起adj.主要的;调皮的
  • trefoil n.车轴草;三叶草;三叶形;翘摇
Noun:
  1. a pointed arch having cusps in the intrados on either side of the apex