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rearview mirror

[reer-vyoo]
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noun
  1. a mirror mounted on the side, windshield, or instrument panel of an automobile or other vehicle to provide the driver with a view of the area behind the vehicle.

Origin of rearview mirror

First recorded in 1925–30; rear1 + view
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for rear-view mirror

rear-view mirror

noun
  1. a mirror on a motor vehicle enabling the driver to see traffic coming behind him or her
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