roof·tree /ˈrufˌtri, ˈrʊf-/
棟梁,屋頂
Roof·tree n. The beam in the angle of a roof; hence, the roof itself.
Now for me the woods may wither, now for me the rooftree fall. --Tennyson.
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rooftree
n : a beam laid along the ridge of a roof; provides attachment
for upper end of rafters [syn: ridge, ridgepole]