angular defect

noun3

1. •
   The amount by which the sum of the interior angles of a triangle is less than 180° (π radians); the amount by which the sum of the internal angles of a polygon is less than what would be expected on the Euclidean plane.

   • Prop. XVI. If the angular defects of two triangles are equal, the areas of the triangles are equal. — 1864
2. •
   The amount by which the total of the angles around a vertex of a polyhedron is less than 360° (2π radians).

   • The angular defect clearly has something to do with curvature, because the larger it is, the more pointed the surface is at the vertex. — 2005
3. •
   The angular displacement of a tooth from vertical.

   • In most instances angular defects have accompanying infrabony pockets; infrabony pockets always have an underlying angular defect. — 1986