peripheral
1. Not of central importance
2. Of or relating to or of the nature of a periphery
3. On or near an edge or constituting an outer boundary
circumferential · encircling · fringy · incident · incidental · marginal · off-base · skirting
peripeteia · peripetia · peripety · periphacitis · peripharyngeal · peripheral · Peripheral Component Interconnect · peripheral control · peripheral device · peripheral devices