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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.
phrenology. n. 1. (Medicine) (formerly) the branch of science concerned with localization of function in the human brain, esp determination of the strength of the faculties by the shape and size of the skull overlying the parts of the brain thought to be responsible for them.