photocathode

noun
pho·​to·​cath·​ode | \ˌfō-tō-ˈka-ˌthōd \

Definition of photocathode 

: a cathode that emits electrons when exposed to radiant energy and especially light

First Known Use of photocathode

1930, in the meaning defined above

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The first known use of photocathode was in 1930

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photocathode

noun
pho·​to·​cath·​ode | \-ˈkath-ˌōd \

Medical Definition of photocathode 

: a cathode (as in a photoelectric cell) that emits electrons when exposed to light or other radiation

More from Merriam-Webster on photocathode

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