Architecture. either of two moldings having a partly convex and partly concave curve for an outline: used esp. in classical architecture. Compare cyma recta, cyma reversa.
2.
Botany. a cyme.
Origin: 1555–65; < NL < Gk kŷma something swollen, a wave, wavy molding, sprout, equiv. to ký(ein) to be pregnant + -ma n. suffix
(click for larger image in new window) n. Either of two moldings, cyma recta or cyma reversa, having an undulating or S-shaped profile, used especially in classical architecture. Also called cymatium.
[New Latin cȳma, from Greek kūma, wave, cyma, from kuein, to swell; see keuə- in Indo-European roots.]