The Collaborative International Dictionary of English v.0.48:

Nomad \Nom"ad\, n. [L. nomas, -adis, Gr. ?, ?, pasturing,
   roaming without fixed home, fr. ? a pasture, allotted abode,
   fr. ? to distribute, allot, drive to pasture; prob. akin to
   AS. niman to take, and E. nimble: cf. F. nomade. Cf.
   Astronomy, Economy, Nimble, Nemesis, Numb,
   Number.]
   One of a race or tribe that has no fixed location, but
   wanders from place to place in search of pasture or game.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nomad \Nom"ad\, a.
   Roving; nomadic.
   [1913 Webster]