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English definition of “ply”

ply

noun [U]     /plaɪ/
the particular number of threads from which wool, rope, etc. is made, used as a measure of its thickness: six balls of four-ply (wool) What ply do you need for that knitting pattern?Measurements in general the particular number of layers from which plywood or tissue is formed, used as a measure of its thickness: Will three-ply (= wood made from three layers stuck together) be strong enough for making a shelf?Measurements in general
(Definition of ply noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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