Definition of rafter noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈrɑːftə(r)//
; NAmE NAmE//ˈræftər//
[countable, usually plural]
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one of the sloping pieces of wood that support a roof Word OriginOld English ræfter, of Germanic origin; related to raft sense (1).Extra examples He could hear something moving about under the rafters. Ropes of onions and garlic hung from the ancient rafters. The insulating material can be secured to the sides of the rafters.
See the Oxford Advanced American Dictionary entry: rafter