alcove post
The main decorative pillar at the side of the tokonoma alcove in a traditional Japanese room, often made of fine wood.
床柱には高級な木材が使われている。
High-quality wood is used for the alcove post.
この部屋の床柱は見事な木目だ。
The alcove post in this room has a beautiful grain.
Compound of 床 (とこ, 'alcove') and 柱 (はしら, 'pillar'). The reading とこばしら reflects rendaku voicing of はしら.