Visitor

google

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late Middle English: from Anglo-Norman French visitour, from Old French visiter (see visit).

wiktionary

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Partly from Middle English visiter, visitere, equivalent to visit +‎ -er; and partly from Middle English visitour, from Anglo-Norman visitour, from Old French visetëor.

etymonline

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visitor (n.)

late 14c., from Anglo-French visitour, Old French visiteor "visitor, inspector," from visiter (see visit (v.)). Sports sense is from 1900.