ETYM Old Eng. nerfe, French nerf, Latin nervus, akin to Greek neuron sinew, nerve; perh. akin to Eng. needle. Related to Neuralgia.
Any bundle of nerve fibers running to various organs and tissues of the body; SYN. nervus.
Bundle of nerve cells enclosed in a sheath of connective tissue and transmitting nerve impulses to and from the brain and spinal cord. A single nerve may contain both motor and sensory nerve cells, but they function independently.

1. Power of endurance or control; fortitude, strength; assurance, boldness; also; presumptuous audacity; gall
2. A sore or sensitive point, plural; nervous agitation or irritability; nervousness

To give strength or courage to; supply with physical or moral force