WATERMILL Meaning of WATERMILL in English wa ‧ ter ‧ mill /ˈwɔːtəˌmɪl $ ˈwɒːtər-, ˈwɑː-/ BrE AmE noun [countable] a ↑ mill that operates using water Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012