the dried stems of wheat or similar plants that animals sleep on, and that are used for making things such as baskets, hats etc → hay.——朗文当代大辞典

The stems or stalks (esp. dry and separated by threshing) of certain cereals, chiefly wheat, barley, oats, and rye. Used for many purposes, e.g. as litter and as fodder for cattle, as filling for bedding, as thatch, also plaited or woven as material for hats, beehives, etc.——牛津当代大辞典  @en