nosing

The horizontally projecting edge of a stair tread.

A shield covering this edge.

A projecting edge of a molding.

In architecture, the projecting edge of a molding or drip; the projecting molding on the edge of a step in a stair.

In a lock, the keeper which engages the latch or bolt.

A metal or rubber shield formed to fit the projecting edge of a tread or step of a stairway to protect it from wear.

That part of the treadboard of a stair which projects over the riser; hence, any like projection, as the projecting edge of a molding.

Present participle of nose.

That part of the treadboard of a stair that projects over the riser.