two-way mirror
noun
a half-silvered sheet of glass that functions as a mirror when viewed from one side but is translucent from the other
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
How to use two-way mirror in a sentence
Several weeks ago, I found myself seated in a small, white-walled room in midtown Manhattan, facing a two-way mirror.
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