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PHY is an abbreviation for the physical layer of the OSI model and refers to the circuitry required to implement physical layer functions. A PHY connects a link layer device (often called MAC as an abbreviation for media access control) to a physical medium such as an optical fiber or copper cable.
Ply is defined as to make multiple layers, to work at, to keep supplying or to keep asking questions. 1  An example of ply is to stack thin sheets of wood together to make plywood.  An example of ply is to use your skills at a job, to ply your craft.