PERIPHERAL
peripheral
(adjective) on or near an edge or constituting an outer boundary; the outer area; “Russia’s peripheral provinces”; “peripheral suburbs”
peripheral
(adjective) related to the key issue but not of central importance; “a peripheral interest”; “energy is far from a peripheral issue in the economy”; “peripheral issues”
peripheral, computer peripheral, peripheral device
(noun) electronic equipment external to the circuit board that contains the CPU of a computer; “disk drives and printers are important peripherals”
Source: WordNet® 3.1
Etymology
Adjective
peripheral (comparative more peripheral, superlative most peripheral)
On the periphery or boundary.
Beside the point.
Unimportant.
Auxiliary.
(neuroanatomy) Related to or located in the peripheral nervous system.
Noun
peripheral (plural peripherals)
(computing) A peripheral device.
Perhipheral vision.
Synonyms
• peripheral device
Source: Wiktionary
Pe*riph"er*al, a.
1. Of or pertaining to a periphery; constituting a periphery;
peripheric.
2. (Anat.)
Definition: External; away from the center; as, the peripheral portion of
the nervous system.
Source: Webster’s Unabridged Dictionary 1913 Edition