Bevel Gear Definition

noun
Either of a pair of gears with teeth surfaces cut so that they can connect unparallel gear shafts.
American Heritage
A toothed-wheel gear meshed with another so that their shafts are at an angle of less than 180°
Webster's New World

A kind of gear in which the two wheels working together lie in different planes and have their teeth cut at right angles to the surfaces of two cones whose apices coincide with the point where the axes of the wheels would meet.

Wiktionary
Synonyms:
  • pinion and ring gear
  • pinion and crown wheel