the waste matter that passes through sewers.

Also sewerage.

Origin of sewage

1825–35; sew(er)1 (as if the ending was -er1) + -age Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sewage



waste matter from domestic or industrial establishments that is carried away in sewers or drains for dumping or conversion into a form that is not toxic

Word Origin for sewage

C19: back formation from sewer 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sewage

1818, from sew (v.) "to drain, draw off water" (late 15c., from sewer (n.1)) + -age.

Online Etymology Dictionary, © 2010 Douglas Harper