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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.
biÂ·oÂ·medÂ·iÂ·cal. (bÄ«'Å-med'i-kÄl), 1. Pertaining to those aspects of the natural sciences, especially the biologic and physiologic sciences, that relate to or underlie medicine. 2. Biologic and medical, that is, encompassing both the science(s) and the art of medicine. biomedical.