Having a garret or attic room; furnished with or containing an upper room or loft.
From garret + -ed (adjectival suffix meaning 'having' or 'furnished with'). This compounds the noun garret with the adjectival suffix to create a descriptive form.
A 'garreted house' is a building with an attic story—the suffix -ed can turn almost any noun into an adjective meaning 'equipped with,' making visible the layers of meaning hiding in English word structure.
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