a person who interrogates.
Also called challenger. Radio. a transmitter that emits a signal to trigger a transponder.

1745–55; < Late Latin interrogātor; see interrogate, -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interrogator (ɪnˈtɛrəˌɡeɪtə)
1.  a person who interrogates
2.  a radio or radar transmitter used to send interrogating signals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It is up to the interrogator to move the conversation back and forth to discern
  the truth.
They require a conscious act of decision on the part of their interrogator to
  gain meaning.
The interrogator gruffly ordered the candidate to sit down.
And eventually, during our conversation, he called himself an interrogator.
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