A wedge-shaped stone placed at the apex of a masonry arch is called a keystone. During construction of the arch, the keystone is the final piece to be placed.
The curve that is used in bridges and over doorways is an arch. An arch is the curved part that is over an opening and it helps support the weight above the opening.
Any part of a curved line., Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed., A flat arch is a member constructed of stones cut into wedges or other shapes so as to support each other without rising in a curve., Any place covered by an arch; an archway; as, to pass into the arch of a bridge., Any curvature in the form of an arch; as, the arch of the aorta., To cover with an arch or arches., To form or bend into the shape of an arch., To form into an arch; to curve., Chief; eminent; greatest; principal., Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad., A chief.
or you may be thinking of your foot arch
Your foot
a curve.
im not sure
The curve of your thumb is the part where it looks rounded, at the base of your thumb.
There is no muscle that connects the sternum to the zygomatic arch. The zygomatic arch is a part of the zygoma, a facial bone. The sternum is in the chest.
Violet
It is part of a curve. If that curve happens to be a circle, then it is a fraction of a circumference but it need not be.
a curve
Laminectomy is the medical term meaning surgical removal of part of a vertebral arch.