Webster's English Dictionary

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transducer

trans.duc.er \tran(t)s-'d(y)u:-s*r, tranz-\ n [L transducere to lead 
   across, fr. trans- + ducere to lead m more at TOW : a device that is 
   actuated by power from one system and supplies power in  any other form to 
   a second system (as a telephone receiver that is actuated by electric power 
   and supplies acoustic power to the surrounding air)