from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Related to, located in, or constituting an outer boundary or periphery.
  • adjective Perceived or perceiving near the outer edges of the retina.
  • adjective Of the surface or outer part of a body or organ; external.
  • adjective Of, relating to, or being part of the peripheral nervous system.
  • adjective Of minor relevance or importance.
  • adjective Auxiliary.
  • noun An auxiliary device, such as a printer, modem, or storage system, that works in conjunction with a computer.

from The Century Dictionary.

  • noun One of the outer bony plates of the carapace of a turtle: commonly termed marginal.
  • Of, belonging to, or situated on the periphery, circumference, or surface generally; characteristic of or constituting the periphery: as, peripheral parts; peripheral expansion.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to a periphery; constituting a periphery; peripheric.
  • adjective (Anat.) External; away from the center.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective on the periphery or boundary
  • adjective beside the point
  • adjective unimportant
  • adjective auxiliary
  • adjective neuroanatomy a part of or located in the peripheral nervous system
  • noun computing a device, such as a printer or scanner, connected to a computer

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (computer science) electronic equipment connected by cable to the CPU of a computer
  • adjective related to the key issue but not of central importance
  • adjective on or near an edge or constituting an outer boundary; the outer area


from Wiktionary, Creative Commons Attribution/Share-Alike License

From peripher-y + -al



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  • "I stared straight ahead as I passed the Volvo, but from a peripheral peek, I would swear I saw him laughing."- Twilight, Stephanie Meyer, pg. 52

    October 27, 2010

  • My main goal is to get into a good grad school. Whether it has a good fitness facility is really a peripheral concern. -Manhattan

    June 10, 2014