door pivot; pivot hinge extensions
Refers to the top and bottom extensions of a traditional Japanese door that fit into sockets in the frame, forming a pivot hinge. A specialized architectural term; compare 枢 (くるる).
See also: 枢 (くるる)
In old Japanese houses, the door's pivot extensions fit into holes in the frame and rotate.
Mixed kanji-kana spelling listed; not commonly used.
The derivation is uncertain. The word likely combines 戸 (to, 'door') with a component related to pivoting or rotating, but the exact origin is unclear.