1 not relating to the most important part of something; incidental, minor, or superficial
2 of, relating to, or of the nature of a periphery
3 (Anatomy) of, relating to, or situated near the surface of the body a peripheral nerve
peripheral device , unit
n (Computing) any device, such as a disk, printer, modem, or screen, concerned with input/output, storage, etc., (Often shortened to)
English Collins Dictionary - English Definition & Thesaurus
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