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rest room

or rest·room

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noun
  1. rooms or a room having a washbowl, toilet, and other facilities for use by employees, visitors, etc., as in a store, theater, or office.
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Origin of rest room

An Americanism dating back to 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for restroom

rest room

noun
  1. a room in a public building having lavatories, washing facilities, and sometimes couches
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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 restroom

n.

also rest-room, 1897, as a room with a toilet, from rest (n.1) + room (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper