sawmill noun 1verb 1forms 3 noun1 •A machine, building, or company used for cutting (milling) lumber or (rarely) other hard materials such as stone.He brought his portable sawmill and turned the old beams into interesting flooring.The old sawmill still has its waterwheel but they took the saw away years ago. verb1 •To process (lumber) in a sawmill. formssawmilled · sawmilling · sawmills