The Collaborative International Dictionary of English v.0.48:

Helvetic \Hel*ve"tic\, a. [L. Helveticus, fr. Helvetii the
   Helvetii.]
   Of or pertaining to the Helvetii, the ancient inhabitant of
   the Alps, now Switzerland, or to the modern states and
   inhabitant of the Alpine regions; as, the Helvetic
   confederacy; Helvetic states. Helvine