the positive plate of an x-ray or other electron tube serving as the target for electrons coming from the cathode, which cause it to emit high-frequency radiations.
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British Dictionary definitions for anticathode
the target electrode for the stream of electrons in a vacuum tube, esp an X-ray tube
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012