one-way mirror

Definition

A mirror reflecting images on one side and transparent on the other, often used by the police during interrogations.

Etymology

From one-way + mirror.

Example Sentences

• ""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"