- rafter (n.)
[rafter 词源字典]
- "sloping timber of a roof," Old English ræftras (West Saxon), reftras (Mercian), both plural, related to Old Norse raptr "log," from Proto-Germanic *raf-tra-, from PIE *rap-tro-, from root *rep- "stake, beam."[rafter etymology, rafter origin, 英语词源]