Medical Definition of peripheral
1: of, relating to, involving, forming, or located near a periphery or surface part (as of the body)
2: of, relating to, affecting, or being part of the peripheral nervous system <peripheral nerves>
3: of, relating to, or being the outer part of the visual field <good peripheral vision>
4: of, relating to, or being blood in the systemic circulation <peripheral lymphocytes> <peripheral blood>
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