"peripheral" in the noun sense
1. peripheral, computer peripheral, peripheral device
electronic equipment external to the circuit board that contains the CPU of a computer
"disk drives and printers are important peripherals"
"peripheral" in the adjective sense
1. peripheral
on or near an edge or constituting an outer boundary the outer area
"Russia's peripheral provinces"
"peripheral suburbs"
2. peripheral
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"
Source: WordNet® (An amazing lexical database of English)
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