'photocathode' definitions:

Definition of 'photocathode'

From: WordNet
noun
A cathode that emits electrons when illuminated

Definition of 'photocathode'

From: GCIDE
  • photocathode \pho`to*cath"ode\ (f[=o]`t[-o]*k[a^]th"[=o]d) n. A cathode that emits electrons when illuminated. [WordNet 1.5]