from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. on the periphery or boundary
  • adj. beside the point
  • adj. unimportant
  • adj. auxiliary
  • adj. a part of or located in the peripheral nervous system
  • n. a device, such as a printer or scanner, connected to a computer

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to a periphery; constituting a periphery; peripheric.
  • adj. External; away from the center.

from The Century Dictionary and Cyclopedia

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

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

  • n. (computer science) electronic equipment connected by cable to the CPU of a computer
  • adj. related to the key issue but not of central importance
  • adj. 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


  • I suspect Martha had seen and/or felt these nodes on Bailey as they were enlarged, a condition we term peripheral lymphadenopathy.

    The Seattle Times

  • You really know how to put the phun in peripheral parenteral nutrition.


  • The team also found that nerves of patients with certain peripheral nerve disorders had defective JAM-C.

    Sticky molecule may hold key to nerve disorders « Isegoria

  • Engineers from the University of Pennsylvania warn against an entirely new threat to computer security: bugs implanted in peripheral devices, such as keyboards or mice.

    After me comes a builder.

  • Similarly, blood clots can form in the arteries that supply the arms or legs; this condition is called peripheral artery disease.

    The Fiber35 Diet

  • Problems in arteries other than those supplying the heart and brain are known as peripheral arterial disease.

    Our Bodies, Ourselves: Menopause

  • Runt disease or splenomegaly (one of its earlier symptoms) provides a test of the immunological competence of cells, and lends itself to exact studies of their immunological capabilities; perhaps the most important discovery that can be credited to it is of the presence of an immunologically competent cell in peripheral blood.

    Peter Medawar - Nobel Lecture

  • Long-term peripheral neuropathy can worsen and lead to an exacerbation of pain. Latest stories

  • Microsoft kicked things off in a big way, showing off their new game "peripheral" -- Kinect Top Stories

  • It serves to remind us that the western perspective - though not "peripheral" - gets a lot wrong and that the real killing fields were not in Normandy or even at Auschwitz, but in nameless horrors across central Europe - in Poland, Belarus, Lithuania, Latvia and the Ukraine, all abused this week by Putin.

    The Guardian World News


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  • 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

  • "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