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metal in the form of a sheet, the thickness being intermediate between that of plate and that of foil
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A flat, rolled metal product, rectangular in cross section and formed with sheared, slit, or sawn edges.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
sheet metal[′shēt ‚med·əl]
Thin sections of metal formed by rolling hot metal and usually less than 0.25 inch (6.35 millimeters) thick; when thicker than 0.25 inch, called plate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A flat, rolled metal product, rectangular in cross section and form, of thickness between 0.006 and 0.249 in. (0.015 and 6.32 cm), with sheared, slit, or sawn edges.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.