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
[sahy-muh] 
