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peripheral

1 of 2

adjective

pe·​riph·​er·​alpə-ˈri-f(ə-)rəl How to pronounce peripheral (audio)
1
:of, relating to, involving, or forming aperiphery or surface part
2
a
:of, relating to, affecting, or being part of the peripheral nervous system
peripheral nerves
peripheral neuritis
b
:of, relating to, or being blood in the systemic circulation
peripheral lymphocytes
3
:of, relating to, or being the outer part of the field of vision
goodperipheral vision
4
:auxiliary,supplementary
peripheral equipment
also:of or relating to computerperipherals
peripherallyadverb

peripheral

2 of 2

noun

:a device connected to a computer to provide communication (such as input and output) or auxiliary functions (such as additional storage)

Did you know?

Your peripheral vision is the outer area of your field of vision, where you can still detect movement and shapes. It can be very valuable when, for instance, you're driving into Chicago at rush hour, especially when switching lanes. When people call an issue in a discussion peripheral, they mean that it's not of primary importance, and they're probably suggesting that everyone get back to the main topic.Peripheral is now also a noun: computer peripherals are the added components—printers, webcams, microphones, etc.—that increase a computer's capacities.

Examples ofperipheral in a Sentence

Adjective If we focus too much onperipheral issues, we will lose sight of the goal.peripheral devices such as modems and scanners He saw in hisperipheral vision that a car was trying to pass him.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage.Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.Send us feedback.
Adjective
These rights are notperipheral to democracy.—Yohuru Williams,The Conversation, 4 Feb. 2026Porter’s moment was equally essential, yet moreperipheral.—Bennett Durando,Denver Post, 1 Feb. 2026
Noun
Meyer captured the scene in mid-January using a Radian Raptor 61 mm telescope paired with an astronomy camera and filters, plus supportingperipheralswhile under dark Arizona skies.—Anthony Wood,Space.com, 5 Feb. 2026Some niche professional software andperipherals are also simply easier to manage in a conventional desktop ecosystem.—New Atlas, 23 Jan. 2026See All Example Sentences forperipheral

Word History

First Known Use

Adjective

1808, in the meaning defined atsense 1

Noun

1966, in the meaning definedabove

Time Traveler
The first known use ofperipheral was in 1808

Cite this Entry

“Peripheral.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peripheral. Accessed 18 Feb. 2026.

Kids Definition

peripheral

1 of 2adjective
pe·​riph·​er·​alpə-ˈrif-(ə-)rəl How to pronounce peripheral (audio)
1
:of, relating to, located in, or forming a periphery
2
:auxiliaryentry 1,supplementary
peripheral equipment
peripherally
-ē
adverb

peripheral

2 of 2noun
:a device connected to a computer to provide communication (as input and output) or extra storage capacity

Medical Definition

peripheral

adjective
pe·​riph·​er·​alpə-ˈrif-(ə-)rəl How to pronounce peripheral (audio)
1
:of, relating to, involving, forming, or located near aperiphery or surface part (as of the body)
2
:of, relating to, affecting, or being part of the peripheral nervous system
peripheral nerves
3
:of, relating to, or being the outer part of the visual field
goodperipheral vision
4
:of, relating to, or being blood in the systemic circulation
peripheral lymphocytes
peripheral blood
peripherallyadverb

More from Merriam-Webster onperipheral

Last Updated: - Updated example sentences
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