- a cathode, typically of a cesium or sodium compound, having the property of emitting electrons when activated by light or other radiation.
Origin of photocathode
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
- a cathode that undergoes or is used for photoemission
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