n A bundle of neurons with their connective tissue sheaths, blood vessels and lymphatics.
n (nonstandard, colloquial) A neuron.
n (botany) A vein in a leaf; a grain in wood.
n Courage; boldness; audacity; gall.
n Patience; stamina; endurance, fortitude.
n (in the plural) One's neural structures considered collectively as, and conceptually equated with, one's psyche.
n (in the plural) Mental agitation caused by fear, stress or other negative emotions.
n (polymer technology) The elastic resistance of raw rubber or other polymers to permanent deformation during processing.
n (obsolete) Sinew, tendon.
v (transitive) To give courage.
v (transitive) To give strength; to supply energy or vigour.