The Collaborative International Dictionary
Bevel gear \Bev"el gear`\ (Mech.) 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
n. A kind of gear in which the two wheels working together lie in different planes and have their tooth cut at right angles to the surfaces of two cones whose apex coincide with the point where the axis of the wheels would meet.
WordNet
n. gears that mesh at an angle [syn: pinion and crown wheel, pinion and ring gear]
Wikipedia
Bevel gears are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. The pitch surface of bevel gears is a cone.
Usage examples of "bevel gear".
New bearings, new bevel gear, new brake, lining, rebored cylinders--they totalled a sum that made Bill gasp.