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actinism

noun as in x-ray

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Actinism, ak′tin-izm, n. the chemical force of the sun's rays, as distinct from light and heat.

An instrument for registering the intensity of the chemical influence (actinism) of the suns rays.

The third constituent of the sunbeam is actinism—its property being to produce chemical effects.

As yet, the effects of actinism have been more studied in the inanimate than the organic creation.

Experiments clearly prove that this change is to be attributed to actinism, and not to heat.

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