ply

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ply

one of the strands twisted together to make rope, yarn, etc.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Ply

A thickness of material used for building up several layers, as in plywood and built-up roofing.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

ply

[plī]
(materials)
A thin sheet of wood or other material bonded to one or more additional thin sheets, as in plywood.
(textiles)
A strand of yarn made by twisting together two or more strands.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ply

ply
One of a number of thin sheets in a layered construction, as in plywood, laminated panels, roofing felt, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

ply

(mathematics, data)
1. Of a node in a tree, the number of branches between that node and the root.

2. Of a tree, the maximum ply of any of its nodes.
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