From WordNet (r) 3.0 (2006):
pasture
n 1: a field covered with grass or herbage and suitable for
grazing by livestock [syn: pasture, pastureland,
grazing land, lea, ley]
2: bulky food like grass or hay for browsing or grazing horses
or cattle [syn: eatage, forage, pasture, pasturage,
grass]
v 1: let feed in a field or pasture or meadow [syn: crop,
graze, pasture]
2: feed as in a meadow or pasture; "the herd was grazing" [syn:
crop, browse, graze, range, pasture]