Noun
A heap or pile of hay, usually covered with thatch for preservation in the open air.
Source: Webster's dictionaryIf this is not done, the top two layers of the stack are often lost to rot and mold, and if the stack is not arranged in a proper hayrick, moisture can seep even deeper into the stack. Source: Internet
Small square bales are stacked in a criss-crossed fashion sometimes called a "rick" or "hayrick". Source: Internet
Threshing machines were a particular target, and hayrick burning was a popular activity. Source: Internet