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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.
n. a sub-specialty of engineering involved in the study and design of biological systems. Certain aspects of these systems are computer-generated and electronically-built such that there is a transfer of new technology involved. At the same time, natural functions are made more efficient and structures are optimized. See biomimetics-also biognosis.