wain /weɪn/noun 2verb 1forms 3 noun2 •(literary, no longer used) A wagon; a four-wheeled cart for hauling loads, usually pulled by horses or oxen."The Hay Wain" is a famous painting by John Constable. •(no longer used) A chariot or similar stately carriage.And the hill-king spake to his footpages twain. Time with me goes slow. — "Put ye the gray pacers now unto the wain," But that grief is heavy I know. — 1828 verb1 •(rare) To carry. formswained · waining · wains