one-way mirror

English

Etymology

From one-way +‎ mirror.

Noun

one-way mirror (plural one-way mirrors)

  1. A mirror reflecting images on one side and transparent on the other, often used by the police during interrogations.
    "The trainee interviews a client in a one-way mirror room or in front of a video camera while being observed by the supervisor, who guides the therapy by telephoning suggestions or bringing the trainee out for discussion." — Learning and Teaching Therapy by Jay Haley

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