Keystone vs. Capstone

Keystonenoun

(architecture) The top stone of an arch.

Keystonenoun

Something on which other things depend for support.

Keystonenoun

A native or resident of the American state of Pennsylvania.

Keystonenoun

(retail) A retail price that is double the cost price; a markup of 100%.

Keystoneverb

(transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.

Keystoneverb

To double the cost price in order to determine the retail price; to apply a markup of 100%.

Keystonenoun

The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch.

Keystonenoun

a central cohesive source of support and stability;

Keystonenoun

the central building block at the top of an arch or vault

Capstonenoun

Any of the stones making up the top layer of a wall; a coping stone.

Capstonenoun

(figurative) A crowning achievement, culmination or finishing touch.

Capstonenoun

A fossil echinus of the genus Cannulus; - so called from its supposed resemblance to a cap.

Capstonenoun

a final touch; a crowning achievement; a culmination

Capstonenoun

a stone that forms the top of wall or building