'photocathode' definitions:
Definition of 'photocathode'
noun
A cathode that emits electrons when illuminated
Definition of 'photocathode'
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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]
