periphery

noun

pe·​riph·​ery pə-ˈri-f(ə-)rē 

plural peripheries

1

: the perimeter of a circle or other closed curve

also : the perimeter of a polygon

2

: the external boundary or surface of a body

3

a

: the outward bounds of something as distinguished from its internal regions or center : confines

b

: an area lying beyond the strict limits of a thing

Synonyms of periphery

• perimeter
• edge
• confines
• circumference
• boundary
• border
• edging

Examples of periphery in a Sentence

the dogs are confined by an invisible electronic fence that runs along the periphery of the yard

Recent Examples on the Web

Most likely, the Dodgers’ deadline moves will be around the periphery. — Maddie Lee, Los Angeles Times, 27 July 2026

In your periphery to the left, a spacewalker traverses the exterior of the station. — Monisha Ravisetti, Space.com, 26 July 2026

Prolonged, heavy rains along the system’s northern periphery are expected to linger through Tuesday evening, raising the chance of flash flooding from Buffalo to Boston. — Marc Ramirez, USA Today, 26 July 2026

In the fall of 1989, a select group of Soviet scientists was summoned to Obolensk, a secluded municipality on Moscow’s periphery, and gathered at what appeared to be an insane asylum to discuss a pioneering technique for mass murder. — Gideon Lewis-Kraus, New Yorker, 25 July 2026

Word History

Etymology

Middle French peripherie, from Late Latin peripheria, from Greek periphereia, from peripherein to carry around, from peri- + pherein to carry — more at bear

First Known Use

circa 1568, in the meaning defined at sense 1

Kids Definition

periphery

noun

pe·​riph·​ery pə-ˈrif-(ə-)rē 

plural peripheries

1

: the boundary or surface of a body or figure

2

: the outer or outermost part

Medical Definition

periphery

noun

pe·​riph·​ery pə-ˈrif-(ə-)rē 

plural peripheries

1

: the outward bounds of something as distinguished from its internal regions or center

2

: the regions (as the sense organs, the muscles, or the viscera) in which nerves terminate