haymow(noun) noun1. a mass of hay piled up in a barn for preservationDefinition categories: quantity, batch, deal, flock, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, raft, sight, slew, spate, stack, wad2. a loft in a barn where hay is storedSimilar word(s): hayloft, mowDefinition categories: man–made, attic, garret, loft