What is "neuro-"

Neuro- \Neu"ro-\ [Gr. ney^ron nerve.] (Anat.) A combining denoting a nerve, of or pertaining to a nerve or the nervous system.

before vowels neur-, word-forming element meaning "pertaining to a nerve or nerves or the nervous system," from Greek neuro-, comb. form of neuron "nerve," originally "sinew, tendon, cord, bowstring," also "strength, vigor," from PIE *(s)neu- "tendon, sinew" (see nerve).

pre. Forming compound words relating to nerves or the nervous system.