English version

one-way mirror

From Longman Dictionary of Contemporary Englishone-way mirrorˌone-way ˈmirror noun [countable] 🔊 🔊 WATCHa mirror which can be used as a window by people secretly watching from the other side of it
Examples from the Corpus
one-way mirrorAt the bottom a one-way mirror gave him a view of the corridor outside.No, he thought, like an investigator in the dark, surveying his subject through a one-way mirror.During his 10-minute absence, the pair were videotaped through a one-way mirror.
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