undercut

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undercut

Forestry chiefly US and Canadian a notch cut in a tree trunk, to ensure a clean break in felling
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Undercut

In stonework, to cut away a lower part, leaving a projection above that serves the function of a drip. To rout a groove back from the edge of an overhanging member.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

undercut

[′ən·dər‚kət]
(electronics)
Undesirable lateral etching by chemicals in the fabrication of semiconductor devices.
(engineering)
Underside recess either cut or molded into an object so as to leave a topside lip or protuberance.
(metallurgy)
An unfilled groove melted into the base metal at the toe of a weld.
To fail to machine a part to a sufficient extent.
(mining engineering)
To cut below or in the lower part of a coal bed by chipping away the coal with a pick or mining machine; cutting is usually done on the level of the floor of the mine, extending laterally the entire face and 5 or 6 feet (1.5 or 1.8 meters) into the material.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

undercut

1. In stonework, to cut away a lower part, leaving a projection above that serves the function of a drip.
2. To rout a groove or channel (a drip) back from the edge of an overhanging member.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.