Keystone Definition

kēstōn
noun
The central, topmost voussoir of an arch, popularly thought of as especially holding the others in place.
Webster's New World
That one of a number of associated parts or things that supports or holds together the others; main part or principle.
Webster's New World
The central supporting element of a whole.
American Heritage

A native or resident of the American state of Pennsylvania.

Wiktionary
adjective
Designating, of, or like the slapstick comedy of a series of silent films featuring a bungling, inept squad of policemen (Keystone Kops or Keystone Cops) in wild chases, etc.
Webster's New World

Other Word Forms of Keystone

Noun

Singular:
keystone
Plural:
keystones

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