photomultiplier tube
noun
pho·to·mul·ti·pli·er tube
ˌfō-tō-ˈməl-tə-ˌplī(-ə)r-
: a vacuum tube that detects light especially from dim sources through the use of photoemission and successive instances of secondary emission to produce enough electrons to generate a useful current
called also photomultiplier
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Merriam-Webster unabridged
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