n. A species of time; -- so called from its resemblance in
form to a trefoil.
a. Having a three-lobed extremity or extremities, as a cross;
also, more rarely, ornamented with trefoils projecting from the edges,
as a bearing.
三叶草, 苜蓿, 车轴草, (纸牌的)梅花;〈建〉三叶饰; croisement en ~ 立体交叉(路)