peripheral (
http://definr.com/peripheral)
adj 1: on or near an edge or constituting an outer boundary; the
outer area; "Russia's peripheral provinces";
"peripheral suburbs" [ant:
central]
2: 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"
n : (computer science) electronic equipment connected by cable
to the CPU of a computer; "disk drives and printers are
important peripherals" [syn:
computer peripheral, {peripheral
device}]