noun.
Any water that has been used by some human domestic or industrial activity and, because of that, now contains waste products.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
water mixed with waste matter
Word Usage
"Detection of significant toxic releases in wastewater prompted a proposal to bring coal ash management under the national law that regulates solid waste, the Resource Conservation and Recover Act (RCRA)."