The "Luff".
When a sail fills out because of wind blowing in it, the curved, concave part is called its 'belly'.
by cutting the curved part.
curved keel
The curved part of a saddle is called the "seat."
Arck
Get a ball. Draw any closed shape on it. The part inside the curve that you drew is one curved face and that is contained by the surface of the ball which is the other curved face.
A part of a curved line. Often part of the circumference of a circle, but not necessarily. An arc can refer to other curved line segments.
It is a part of the sail.
There are no curved edges in a pentagon. Part of the definition of any polygon is that they have straight edges.
No. It's straight through the center of the sphere that the curved surface is part of.
The pupil is a hole, there isn't a clear curved membrane begind it. The rertina is curved, however the retina isn't clear.