Noun: photocathode ,fow-tow'ka,thowd
- A cathode that emits electrons when illuminated
"The photomultiplier tube used a photocathode to convert light into an electrical signal"
Derived forms: photocathodes
Type of: cathode, kathode [archaic]
Part of: electric eye, magic eye, photocell, photoconductive cell, photoelectric cell
Encyclopedia: Photocathode