[ˈkiːstəʊn], (Noun)

Definitions:
- a central stone at the summit of an arch, locking the whole together


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[ˈkiːstəʊn], (Noun)

Definitions:
- a US film company formed in 1912, remembered for its silent slapstick comedy films, many featuring the bumbling Keystone Kops police characters


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