枢

くるる · くろろ · くる · くるり

1. noun pivot hinge (using extensions on the top and bottom of a door that fit into cavities in the frame)
2. sliding wooden bolt (for holding a door or window shut)

とぼそ

1. noun cavities in the frame of a door used as part of a pivot hinge
2. archaic door

とまら also 戸まら

1. noun, usually in kana extensions on the top and bottom of a door that fit into cavities in the frame (as part of a pivot hinge)