[trans-doo-ser, -dyoo-, tranz-]
a device that receives a signal in the form of one type of energy and converts it to a signal in another form: A microphone is a transducer that converts acoustic energy into electrical impulses.

1920–25; < Latin trānsdūc(ere) to transfer (see traduce) + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
transducer (trænzˈdjuːsə)
any device, such as a microphone or electric motor, that converts one form of energy into another
[C20: from Latin transducere to lead across, from trans- + ducere to lead]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1924, "device which converts energy from one form to another," from L. transducere "lead across, transfer," from trans- "across" + ducere "to lead" (see duke). The verb transduce is recorded from 1949.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
transducer   (trāns-d'sər)  Pronunciation Key 
A device that converts one type of energy or signal into another. For example, a microphone is a transducer that converts sound waves into electric impulses; an electric motor is a transducer that converts electricity into mechanical energy.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for transducers
In electronic engineering, actuators actt, are a subdivision of transducers.
A loudspeaker design which has transducers on the front and the rear of the enclosure.
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