dewaterPronunciation: /diːˈwɔːtə/Definition of dewater verb [with object] drain (a waterlogged or flooded area): (as noun dewatering)a study will determine the impact of dewatering in the Humboldt Basin area remove water from (sediment or waste materials): in theory, this equipment could dewater sewage sludge, but that would require more developmentdewater in other Oxford dictionaries Definition of dewater in the US English dictionary