- A molding for a cornice, having a partly concave and partly convex curve in profile, used especially in classical architecture. Also called cymatium 反曲线饰：纵断面部分为凹线，部分为凸形的檐口的线脚，尤用在古典建筑中 也作 cymatium
- Greek kuma [wave, cyma] 希腊语 kuma [曲线，反曲线]
- from kuein [to swell] * see keuə- 源自 kuein [使隆起] * 参见 keuə-