WordReference Random House Unabridged Dictionary of American English © 2019
snoop•er•scope  (sno̅o̅pər skōp′),USA pronunciation n. 
  1. Optics, Militarya device that displays on a fluorescent screen reflected infrared radiation, enabling the user to see objects obscured by darkness.
  • snooper + -scope 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::

snooperscope /ˈsnuːpəˌskəʊp/ n
  1. US an instrument that enables the user to see objects in the dark by illuminating the object with infrared radiation and converting the reflected radiation to a visual image

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