Courtroom

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Middle English: from Old French cort, from Latin cohors, cohort- ‘yard or retinue’. The verb is influenced by Old Italian corteare, Old French courtoyer . Compare with cohort.

wiktionary

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court +‎  room

etymonline

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courtroom (n.)

"chamber in which a court of law is held," 1670s, from court (n.) + room (n.).