one-way mirrorone-way mirror
(plural one-way mirrors)
- A mirror reflecting images on one side and transparent on the other, often used by the police during an interrogation.
- "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