quatrefoil

quat.re.foil

n.（名词）
A representation of a flower with four petals or a leaf with four leaflets, especially in heraldry.
四小叶复叶，十字花：由一朵花和四片花瓣或一片叶子和四片小叶组成的图纹，尤见于纹章
Architecture Tracery or an ornament with four foils or lobes.
【建筑学】 四叶饰：有四片叶子或裂片的窗花格或装饰品

来源：
Middle English quaterfoile
中古英语 quaterfoile
Old French quatre [four] * see quatrain
古法语 quatre [四] *参见 quatrain
Old French foil [leaf] * see foil 2
古法语 foil [叶子] *参见 foil2