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rafter (n.1)

"sloping timber of a roof," c. 1200, from Old English ræftras (West Saxon), reftras (Mercian), both plural, "a beam, pole, rafter of a building," related to Old Norse raptr "log," from Proto-Germanic *raf-tra-, from PIE *rap-tro-, from root *rep- "stake, beam."

rafter (n.2)

1809, "one employed in rafting timber," agent noun from raft (v.). By 1978 as "one who uses a recreational raft."

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Definitions of rafter from WordNet
1
rafter (n.)
one of several parallel sloping beams that support a roof;
Synonyms: balk / baulk
rafter (n.)
someone who travels by raft;
Synonyms: raftsman / raftman
2
rafter (v.)
provide (a ceiling) with rafters;
From wordnet.princeton.edu