The Collaborative International Dictionary of English v.0.48:

Hayrick \Hay"rick`\ (-r[i^]k`), n.
   A heap or pile of hay, usually covered with thatch for
   preservation in the open air.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hayrick
    n 1: a stack of hay [syn: haystack, hayrick, rick]