Definition of "microphone" []

• An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter. (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.

• "All camcorders have a built-in microphone, which is fine for recording videos in ideal conditions — but you will rarely have ideal conditions if you are videoblogging political events."
• "Mr. Taylor, with our sincere thanks for being here today, the microphone is yours."
• "Mr. Quinlan, with our sincere thanks for your being here, the microphone is yours."