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wastewater

[weyst-waw-ter, -wot-er]
noun
  1. water that has been used in washing, flushing, manufacturing, etc.; sewage.
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Origin of wastewater

1400–50; late Middle English waste watre
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for wastewater

n.

mid-15c., from waste (adj.) + water (n.1).

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Online Etymology Dictionary, © 2010 Douglas Harper