noun
also ci·ma or si·ma ˈsīmə
( -s )
Etymology: Greek kyma wave, waved molding — more at cyme
1. : a projecting molding whose profile is a double curve:
a. or cyma rec·ta | ̷ ̷ ̷ ̷ˈrektə
[New Latin, literally, straight cyma]
: such a molding with the upper part concave
b. or cyma re·ver·sa -rə̇ˈvərsə
[New Latin, literally, reversed cyma]
: such a molding with the upper part convex
2. : a double curve formed by the union of a concave line and a convex line