a place on the inner elbow where the ulnar nerve passes close to the surface: a sharp impact at this place causes a strange, tingling sensation in the arm
inclination to laughter; (one's) risibilities
Origin:
from its reaction to impact, but prob. suggested also by its relation to the humerus (hence, “humorous”)
See funny bone in American Heritage Dictionary 4
noun Informal
A point on the elbow where the ulnar nerve runs close to the surface and produces a sharp tingling sensation if knocked against the bone.