Definitions

1. adjective

located or situated on the edge or surface of something, especially a machine or computer system.

“The peripheral devices attached to the computer include a printer and a scanner.”

2. noun

a device or system that is connected to a central unit or device, such as a computer or a machine.

“The peripheral of the computer system includes the keyboard, mouse, and monitor.”

3. noun

the outer or outermost part of something, especially a bodily organ or system.

“The peripheral nervous system is responsible for transmitting nerve impulses between the central nervous system and the rest of the body.”