[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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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Computing Dictionary

transducer definition

1. A device for converting sound, temperature, pressure, light or other signals to or from an electronic signal.
2. Finite State Machine.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
High-frequency sound waves are directed from a hand-held transducer probe to the area.
To do all this, though, you need a device called a transducer.
Two metal loops hold it to the sides of the artery, and a pressure transducer records the flow of fluids through the blood vessel.
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