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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.
Pathy is defined as a feeling or suffering, a disease or the treatment for a disease. An example of pathy as a suffix is apathy, which is the lack of feeling. An example of pathy as a suffix is myopathy, which is the disease of a muscle. An example of pathy as a suffix is homeopathy, which is a natural medical treatment.