n.
Pronunciation: ˌ per- ə - ' nu ̇ r- ē - ə m, - ' nyu ̇ r-
Function: noun
Inflected Form: plural -ria \ - ē - ə \
Etymology: New Latin, from peri- + Greek neuron nerve ― more at NERVE
Date: circa 1842
: the connective-tissue sheath that surrounds a bundle of nerve fibers