corner chisel[′kȯr·nər ‚chiz·əl]
A chisel with two cutting edges at right angles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A chisel having two cutting edges which meet at right angles; used for cutting corners of mortises.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.