Definition of photonegative in US English:



  • 1Biology
    (of an organism) tending to move away from light.

    • ‘Species commonly initiate strongly photonegative swimming when the intensity of light decreases, such as would occur when a predator passes overhead; the behavior is known as the ‘shadow response.’’
    • ‘Homozygous ß3 mutant larvae were also photonegative, but hemizygous ß3 mutant larvae were photoneutral.’
  • 2Physics
    (of a substance) exhibiting a decrease in electrical conductivity under illumination.

    • ‘In this process, photonegative materials will be removed while photopositive materials remain in the final device.’
    • ‘This form of dielectric, in one aspect, is a photonegative paste.’