Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: French
Origin: pli, from Old French plier; PLIERS

ply

2 noun
     
ply2 plural ply [countable]
a unit for measuring the thickness of thread, rope, plywood etc, based on the number of threads or layers that it has:
a sweater in 4-ply yarn
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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