The Collaborative International Dictionary of English v.0.48:

pastureland \pas"ture*land`\ n.
   A field covered with grass or herbage and suitable for
   grazing by livestock; pasture.

   Syn: pasture, grazing land, lea, ley.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

pastureland
    n 1: a field covered with grass or herbage and suitable for
         grazing by livestock [syn: pasture, pastureland,
         grazing land, lea, ley]