peripheral Hear it!

peripheral definition

pe·riph·eral (pə rif′ə rəl)

adjective

  1. of, belonging to, or forming a periphery
    1. lying at the outside or away from the central part; outer; external
    2. Anat. of, at, or near the surface of the body; specif., designating or of that part of a nervous system that branches out from a central nervous system
  3. only slightly connected with what is essential or important; merely incidental

noun

a piece of equipment that can be used with a computer to increase its functional range or efficiency, as a printer, scanner, disk, etc.

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