two-way mirror Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
two-way mirror
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They remember the months they sat behind a two-way mirror and listened to
  panels of citizens talk about race.
The interactions were videotaped through a two-way mirror.
Groups or individuals could monitor sessions from behind a two-way mirror.
During investigation period, joint interviews are scheduled and conducted,
  using a two-way mirror and listening devices.
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