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Longman Dictionary of Contemporary English
two-way mirror
noun
EXAMPLES FROM CORPUS
▪ It had been a short honeymoon: one night in front of a two-way mirror.
▪ Lifeline 1990 consists of a two-way mirror, paint, light, timers and wood.
Wiktionary
two-way mirror

n. A mirror that is partially reflective and partially transparent

Wikipedia
Two-Way Mirror

Two-Way Mirror is the third studio album of the band Crystal Antlers. It was released by Recreation Ltd. on July 12, 2011. Former albums of the band was released by Touch And Go Records.

Usage examples of "two-way mirror".

Watching from behind the two-way mirror in the Security Command Center control booth, Tristan was forced to flip off the hidden microphone and close his eyes, no longer able to bear her fierce and unyielding beauty.

We can now confirm that Basser Assad was present at Aleppo Four, apparently watching the rapings and torture from behind a two-way mirror.

A two-way mirror against the far wall gave whoever was behind it a good look at the whole room.

There was no two-way mirror, but she spotted the four scan-cams snugged into corners.

Through the two-way mirror, the Colonel snapped picture after picture of the senator's hairy, overweight body performing a series of truly astonishing sexual gymnastics with a sleek-bodied Japanese boy of no more than twelve.

He went into the next room, where Diana had been observing through a two-way mirror.

He ushered me in, waiting until the door shut before turning to the two-way mirror and silently shifting the blinds.

He had been instructed not to look for bugs, since he couldn't be sure that he was not being observed through some two-way mirror device.

I entertained a few wicked fantasies about Dietz, while observing Bibianna and Jimmy idly as if through a two-way mirror.

Surprisingly there were only two young girls seated, one at the two-way mirror which scanned the floor for shoplifters.

She didn't like deceiving him, didn't want him not knowing she was going to be there, just on the other side of his two-way mirror.

I've been able to sit in on interrogations -- the other side of the two-way mirror, I mean.