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In arch construction, what is the keystone? | QuestionStock

Representative image for question: In arch construction, what is the keystone?

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Architecture

In arch construction, what is the keystone?

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In arch construction, what is the keystone?

Options:

The central wedge-shaped stone at the apex that locks the arch's voussoirs
A horizontal lintel spanning the base of the arch
A decorative boss applied to the exterior of the arch
A foundation block supporting the arch's springing

Correct answer: The central wedge-shaped stone at the apex that locks the arch's voussoirs

Explanation: The keystone is the central wedge-shaped stone at an arch's apex that locks the voussoirs together. Romans widely used keystones in arch construction by the 1st century AD.

Created 2026-03-10T17:31:04.555Z. Updated 2026-03-10T17:31:04.555Z.