water that has been used in washing, flushing, manufacturing, etc.; sewage.
Origin of wastewater
1400–50; late Middle English waste watre
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for waste-water
Historical Examples of waste-water
Have you ever heard 'em talking of barrage and aprons and waste-water?The Day's Work, Volume 1
Online Etymology Dictionary, © 2010 Douglas Harper