Pronunciation: (pu-rif'ur-ul),[key] —adj. 1. pertaining to, situated in, or constituting the periphery: peripheral resistance on the outskirts of the battle area. 2. concerned with relatively minor, irrelevant, or superficial aspects of the subject in question.
3. Anat.near the surface or outside of; external.
4. Computers.of or pertaining to a peripheral.
—n. Computers.a device or unit that operates separately from the CPU but is connected to it, as a magnetic disk or tape unit or a printer. Also,peripheric(for defs. 1–3).