Tangential /(?)/

Tan·gen·tial

Tangential

a.
  1. Of or pertaining to a tangent; in the direction of a tangent. (Geom.)

Phrases & Compounds

Tangential force
a force which acts on a moving body in the direction of a tangent to the path of the body, its effect being to increase or diminish the velocity; -- distinguished from a normal force, which acts at right angles to the tangent and changes the direction of the motion without changing the velocity.
Tangential stress
See Shear, n., 3.