An aeroplane or spacecraft hangar is a building or structure with such purpose. Concrete, wood, or metal are used to construct hangars. The word "hangar" is derived from the Middle French word "hanghart," which means "enclosure around a house" and has Germanic roots. It is derived from the Frankish word "haimgard," which means "home-enclosure" and "fence around a group of dwellings" ("yard"). The word "gard" derives from the Old Norse word "garr" ("enclosure, garden").