one-way mirror

== English == === Etymology === From one-way +‎ mirror. === Noun === one-way mirror (plural one-way mirrors) 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 ==== Synonyms ==== two-way mirror ==== Translations ====