Cyma

cyma [ˈsaɪmə]
n pl -mae [-miː], -mas
1. (Fine Arts & Visual Arts / Architecture) either of two mouldings having a double curve, part concave and part convex.

Cyma reversa: A cyma in which the upper section is convex and the lower section concave ...

Cyma recta - A double-curved moulding, concave above and convex below; also called an ogee moulding.
Cyma reversa - A double-curved moulding, convex above and concave below; also called a reverse ogee moulding.
Architecture Glossary ...

Cyma Recta - A molding consisting of double elements, concave above, convex below.
Cyma Reversa - A molding opposite of the cyma recta, here concave below, convex above.

Cyma
A moulding with a double curvature is called a cyma or sometimes, a wave moulding. Used as the uppermost element in a cornice.
Cyma Recta ...

Best known are - Bird's beak; Bead and reel; Cable, (like a rope); Cavetto, (a moulding with a concave profile describing a quater of a circle); Chevron; Cyma recta, (convex to concave); Cyma reversa, or ogee, (concave to convex); ...

This is used at the top of arches as well as for the profile of moldings. The ogee arch is Gothic in design. If the ogee curve has the convex or hollow part upwards it is referred to as Cyma Reversa or Cyma Rectas.

sub-cusping the sides of the cusps have smaller cusps, usually on a recessed plane.CutwaterA curved- or angle-ended stage at the bottom of a bridge pier.Cyclopean masonryLarge irregular polygonal stones, smooth and finely jointed.Cyma ...

A classical molding with a double curve or cyma profile, as in an ogee bracket foot.
Onlay:
Decorative trip applied to the surface of a piece, also known as Overlay or Appliqu.

Ogee - A double-curved or inverted s-shape. Victorian and Edwardian buildings have ogee spouting. (Refer: Cyma recta)
Open work - Decorative panel consisting largely of voids.

It is built of large dressed ashlar blocks with a cyma reversa moulding at 16 m above ground level. Generally during the Ottoman period the square tower was abandoned in favour of the octagonal or cylindrical minaret.

See also: Architecture, Profile, Moulding, Cyma recta, Cyma reversa