WordNet (r) 3.0 (2006):

Coriolis effect
    n 1: (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