A word meaning “new, built again” appearing as an element in [N.] Ostechain “Town Built Again” which Tolkien considered as an alternate name for Osgiliath in Lord of the Rings drafts from the 1940s (TI/424). Roman Rausch suggested it may be based on some combination of ad- “again” and an adjectival form of √KAT “make” (EE/2.67), perhaps from ancient *ad-katyā.