pe·riph·er·al
pə-ˈri-f(ə-)rəl
1
: of, relating to, involving, or forming a periphery or surface part
2
a
: of, relating to, affecting, or being part of the peripheral nervous system
peripheral nerves
peripheral neuritis
b
: of, relating to, or being blood in the systemic circulation
peripheral lymphocytes
3
: of, relating to, or being the outer part of the field of vision
good peripheral vision
4
: auxiliary, supplementary
peripheral equipment
also
: of or relating to computer peripherals
peripherally
adverb
: a device connected to a computer to provide communication (such as input and output) or auxiliary functions (such as additional storage)
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Merriam-Webster unabridged
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