photonegative - WordReference.com Dictionary of English

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photonegative

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Concise Oxford English Dictionary © 2008 Oxford University Press:
photonegative/fəʊtəʊˈnɛɡətɪv/

▶adjective

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

2 Physics (of a substance) exhibiting a decrease in electrical conductivity under illumination.

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