Turret

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Middle English: from Old French tourete, diminutive of tour ‘tower’.

wiktionary

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From Middle English touret, from Old French torete (French tourette), diminutive of tour(“tower”), from Latin turris. See tower.

etymonline

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turret (n.)

c. 1300, touret "small tower forming part of a city wall or castle," from Old French torete (12c., Modern French tourette), diminutive of tour "tower," from Latin turris (see tower (n.1)). Meaning "low, flat gun-tower on a warship" is recorded from 1862, later also of tanks. Related: Turreted. Welsh twrd is from English.