A small fortified watchtower or guardroom, typically found on castle walls or fortifications.
From Spanish 'garita' or French 'guérite', possibly related to 'garde' (guard). It entered English through military and architectural terminology describing medieval fortifications.
Medieval castle architects used 'guerite' towers for observation and defense—they're those little jutting turrets you see in castle pictures, and the word traveled from Spanish military terminology into English architectural texts.
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