Coriolis effect

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

• noun The observed effect of the Coriolis force, especially the deflection of an object moving above the earth, rightward in the Northern Hemisphere and leftward in the Southern Hemisphere.

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

• noun (physics) an effect whereby a body moving in a rotating frame of reference experiences the Coriolis force acting perpendicular to the direction of motion and to the axis of rotation; on Earth the Coriolis effect deflects moving bodies to the right in the northern hemisphere and to the left in the southern hemisphere