in·ter·ro·ga·tor

[in-ter-uh-gey-ter]
noun
1.
a person who interrogates.
2.
Also called challenger. Radio. a transmitter that emits a signal to trigger a transponder.

Origin:
1745–55; < Late Latin interrogātor; see interrogate, -tor

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World English Dictionary
interrogator (ɪnˈtɛrəˌɡeɪtə) [Click for IPA pronunciation guide]
 
n
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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00:10
Interrogator is always a great word to know.
So is quincunx. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
The small rectangular tags respond to radio waves sent by a special transmitter
  called an interrogator.
And eventually, during our conversation, he called himself an interrogator.
It is up to the interrogator to move the conversation back and forth to discern
  the truth.
Inform aircraft concerned when the ground interrogator appears to be
  inoperative or malfunctioning.
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