Definition of "one-way mirror" []

• A mirror that is reflective on one side and transparent on the other, often used in surveillance. Also called two-way mirror. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Kurtz knew that it was not going to be an easy interrogation when Hathaway, the homicide cop, lowered some louvered blinds over the one-way mirror lining one wall of the interrogation room and then ripped the recording-microphone wire out of its jack on the floor."