n. 栋梁, 屋

[ noun ]
a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters
<noun.artifact>

Rooftree \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.