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bullnose, bull’s-nose

1. A blunt or curved outside corner, as the corner made by two walls.
2. A structural member or trim having a rounded edge, as on stair treads, window sills, doors, etc.
3. In plastering, a metal bead used on exterior corners where rounded edges are required.
4. A small, hand-held carpenter’s plane with the cutting edge set near the front of the grip.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.