The Collaborative International Dictionary of English v.0.48:

Barnyard \Barn"yard`\, n.
   A yard belonging to a barn.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barnyard
    n 1: a yard adjoining a barn

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "barnyard":
   arable land, barton, cattle ranch, chicken farm, collective farm,
   cotton plantation, croft, dairy farm, demesne, demesne farm,
   dry farm, dude ranch, factory farm, fallow, farm, farmery,
   farmhold, farmland, farmplace, farmstead, farmyard, fruit farm,
   fur farm, grain farm, grange, grassland, hacienda, homecroft,
   homefarm, homestead, kibbutz, kolkhoz, location, mains, manor farm,
   orchard, pasture, pen, plantation, poultry farm, ranch, rancheria,
   rancho, sheep farm, station, steading, stock farm, toft,
   truck farm