From Longman Dictionary of Contemporary Englishthree-plyˈthree-ply adjective TIthree-ply wood, wool, tissue etc consists of three layers or threads
Examples from the Corpus
three-ply• This means that you need to use a fine yarn, two- or three-ply for standard gauge machines.• Cast on in full needle rib, using cast on two and a three-ply or similar weight yarn. 