bevel gear

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Either of a pair of gears with teeth surfaces cut so that they can connect unparallel gear shafts.

from The Century Dictionary.

• noun In machinery, a species of wheelwork in which the axis or shaft of the leader or driver forms an angle with the axis or shaft of the follower or the wheel driven.

from the GNU version of the Collaborative International Dictionary of English.

• (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun gears that mesh at an angle