The Collaborative International Dictionary of English v.0.48:

Nomadic \No*mad"ic\, a. [Gr. ?. See Nomad.]
   Of or pertaining to nomads, or their way of life; wandering;
   moving from place to place for subsistence; as, a nomadic
   tribe. -- No*mad"ic*al*ly, adv.
   [1913 Webster]