photocell

from WordNet (r) 3.0 (2006)

photocell
    n 1: a transducer used to detect and measure light and other
         radiations [syn: {photoelectric cell}, {photoconductive
         cell}, {photocell}, {electric eye}, {magic eye}]

from The Collaborative International Dictionary of English v.0.48

photocell \pho"to*cell`\ (f[=o]"t[-o]*s[e^]l`) n.
   An electrical device which changes voltage or resistance upon
   exposure to light, used to detect and measure light and other
   radiations.

   Syn: photoelectric cell, electric eye.
        [WordNet 1.5]