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Noun: photoreceptor  ,fow-tow-ri'sep-tu(r) or 'fow-tow-ri,sep-tu(r)
  1. A specialized sensory cell or organ capable of detecting light, found in the retina of the eye or in light-sensitive organs of other organisms
    "Rods and cones are the two main types of photoreceptors in the human eye"

Derived forms: photoreceptors

Encyclopedia: Photoreceptor