noun
Specifically the wooden frame or stile of a sliding door (障子や襖の框).
障子の桟が外れてしまった。
The frame of the sliding screen came off.
noun
A horizontal or transverse bar used in construction, furniture, or joinery.
この椅子の桟が折れてしまった。
The crosspiece of this chair broke.
noun
sliding wooden bolt (for a door or window)
A traditional wooden latch that slides horizontally to secure a door or window; also called 猿 (さる) in some contexts.
See also: 猿
雨戸の桟をかけて鍵をかける。
Slide the wooden bolt on the storm shutter to lock it.