howler(redirected from Howlers)
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any large New World monkey of the genus Alouatta, inhabiting tropical forests in South America and having a loud howling cry
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
In telephone practice, an associated unit by which the test desk operator may connect a high tone of varying loudness to a subscriber's line to call the subscriber's attention to the fact that the phone receiver is off the hook.
An audio device used to warn a radar operator that signals are appearing on a radar screen.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.