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from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. See orthicon.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons


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