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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.
onÂ·colÂ·oÂ·gy. The study or science dealing with the physical, chemical, and biologic properties and features of neoplasms, including causation, pathogenesis, and treatment. oncology. /onÂ·colÂ·oÂ·gy/ (ong-kolÂ´ah-je) the sum of knowledge regarding tumors; the study of tumors.