Angle's classification of malocclusion

[ănggəlz]
n.
  1. A classification of different types of malocclusion, based on the mesiodistal relationship of the permanent molars upon their eruption and locking.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.