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Electronics an unwanted prolonged high-pitched sound produced by a sound-producing system as a result of feedback
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Undesirable prolonged sound produced by a radio receiver or audio-frequency amplifier system because of either electric or acoustic feedback.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.