peripheral

Related to, located in, or constituting an outer boundary or periphery.

Perceived or perceiving near the outer edges of the retina.

Of the surface or outer part of a body or organ; external.

Of, relating to, or being part of the peripheral nervous system.

Of minor relevance or importance.

Auxiliary.

An auxiliary device, such as a printer, modem, or storage system, that works in conjunction with a computer.

One of the outer bony plates of the carapace of a turtle: commonly termed marginal.

Of, belonging to, or situated on the periphery, circumference, or surface generally; characteristic of or constituting the periphery: as, peripheral parts; peripheral expansion.