one-way mirror

American  

noun

1. a sheet of glass that can be seen through from one side and is a mirror on the other, used especially for observation of criminal suspects by law-enforcement officials or witnesses.

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Example Sentences

And when his department, steeped in macho culture and eager for more mall arrests, starts deploying a video camera behind a one-way mirror, an increasingly anxious Lucas is made to feel nothing but risk about his identity.

From Los Angeles Times

An installation with a one-way mirror and two seats will invite visitors to participate.

From Seattle Times

"I ducked down, it was 7am in the morning. That was when I got the one-way mirror film put in."

From BBC

Yet as Bellamy sat composing amid a thicket of electric guitars and vintage synths — including an old Roland model he says was the same used for the “Stranger Things” theme — what really inspired him was the tumult unfolding outside the studio, which he observed through an enormous one-way mirror in the building’s front wall.

From Los Angeles Times

The therapy focuses on the fractured bond between parent and child, as clinicians hidden behind a one-way mirror coach the parent through an earpiece on how to respond to their children in healthier ways.

From Los Angeles Times