keystone etymology

Etymology:

• Keystone is derived from the Middle English word "keyston," which itself is from the Old English words "cy" (key) and "stan" (stone).

Meaning and Origin:

• A keystone is the wedge-shaped stone or brick at the apex of an arch or vault.
• It is the final piece that holds the arch or vault in place and prevents it from collapsing.
• The term was first used in the 13th century to describe the central stone in a Gothic arch.
• The keystone is often used metaphorically to refer to a person or thing that is essential or pivotal to the success or stability of something else.

keystone relate terms

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• knight

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• compound

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