peripheral

1 of 2

adjective

pe·​riph·​er·​al pə-ˈri-f(ə-)rəl 

1

: of, relating to, involving, or forming a periphery 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

good peripheral vision

4

: auxiliary, supplementary

peripheral equipment

also : of or relating to computer peripherals

peripherally adverb

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.

Synonyms

Adjective

• accessorial
• accessory
• appurtenant
• auxiliary
• supplemental
• supplementary

Examples of peripheral in a Sentence

Adjective

If we focus too much on peripheral issues, we will lose sight of the goal.

peripheral devices such as modems and scanners

He saw in his peripheral vision that a car was trying to pass him.

Recent Examples on the Web

Adjective

Those settlements show another, quieter front in China’s expanding efforts to assert its control over disputed, peripheral territories – also playing out in the South and East China Seas – as Chinese leader Xi Jinping seeks to bolster national security and enhance China’s position over its rivals. —Simone McCarthy, CNN, 5 Nov. 2024

There’s also very clear softness and smearing in your peripheral vision. —Andrew Williams, Forbes, 28 Oct. 2024

Noun

The whole thing is held up by the integrated stand, an elegant-looking foot that (like the rest of the iMac) has the same colorful finish as the display and peripherals. —Brian Westover, PCMAG, 7 Nov. 2024

High-performance mechanical switches or potentiometer sticks still perform incredibly well, and some budget Hall effect peripherals will still cheap out on materials, quality control, and manufacturing tolerances. —Henri Robbins, WIRED, 4 Nov. 2024

Word History

First Known Use

Adjective

1808, in the meaning defined at sense 1

Noun

1966, in the meaning defined above

Phrases Containing peripheral

• peripheral nervous system
• peripheral neuropathy

Kids Definition

peripheral

1 of 2 adjective

pe·​riph·​er·​al pə-ˈrif-(ə-)rəl 

1

: of, relating to, located in, or forming a periphery

2

: auxiliary entry 1, supplementary

peripheral equipment

peripherally

-ē

adverb

peripheral

2 of 2 noun

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

Medical Definition

peripheral

adjective

pe·​riph·​er·​al pə-ˈrif-(ə-)rəl 

1

: of, relating to, involving, forming, or located near a periphery 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

good peripheral vision

4

: of, relating to, or being blood in the systemic circulation

peripheral lymphocytes

peripheral blood

peripherally

-ē 

adverb