hara 
KEY WORD : architecture / general terms
 
Lit. belly. The concave underside, of a curved beam, for example, a curved transverse beam *koyabari 小屋梁. The upper side is convex and is called *se 背. When a beam is cut on the upper side, the uncut or unshaped under side is called hara. Hara can also mean both sides, ryouwaki 両脇, of a board. If the entire beam is rounded, the whole beam is referred to as hara.
 
 

 
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