three-ply

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three-ply

[′thrē ′plī]
(science and technology)
Consisting of three distinct strands, layers, or veneers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

three-ply

Consisting of three layers, thicknesses, laminations, etc., as veneers in plywood; where the layers have a grain or orientation, usually the grain in adjacent layers is opposite.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.