Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
Properly so called, was not in use among the Hebrews; straw was used instead. They cut the grass green as it was needed. The word rendered "hay" in Pr. 27:25 means the first shoots of the grass. In Isa. 15:6 the Revised Version has correctly "grass," where the Authorized Version has "hay."