peg third molar
peg third mo·lar(peg thĭrd mō'lăr)
Third molar tooth that has a conic form in which tooth surfaces taper toward the occlusal surface.
peg third molar,
n a developmental anomaly of the third molar (wisdom tooth) in which the crown fails to develop fully in any one of its four quadrants; developmental disturbance of partial microdontia.