Accompanying as a subordinate; additional; accessory; especially, uniting in, or contributing to, a crime, but not as chief actor. See accessory.
Someone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense.
Auxiliary.
Related to or located in the peripheral nervous system.
Unimportant.
Beside the point.
On the periphery or boundary.
Peripheral vision.
A peripheral device.