Definition of actinic in English:


Syllabification: ac·tin·ic
Pronunciation: /akˈtinik


1(Of light or lighting) able to cause photochemical reactions, as in photography, through having a significant short wavelength or ultraviolet component.
More example sentences
  • This approach can be very cost-effective, since the cost of non-LED based actinic illumination is significantly lower than LED-based illumination.
  • These states were detected both by short actinic flashes and by the switching of the actinic illumination level between different stationary state values.
  • Leaves were then illuminated with actinic light and saturating flashes of 0.7 s duration were applied every 1.5 min.
1.1Relating to or caused by actinic light: actinic degradation
More example sentences
  • Alternative processes are most sensitive to UV light, and since the stain of Pyro developers functions as a highly actinic filter to UV light it follows that the stain can add a lot of effective printing contrast to a negative.
  • It is cheap, easy to mix and robust in its ability to produce an effective actinic (UV blocking) stain with no loss of film speed.
  • It is important to emphasize that the localization of p53 mutations found in actinic keratoses, NMSC and histologically normal tissue adjacent to tumors parallels the pattern of COX - 2 expression observed in this study.


mid 19th century: from Greek aktis, aktin- 'ray' + -ic.



Pronunciation: /ˈaktəˌnizəm/
More example sentences
  • Optical radiation may cause chemical changes in living or non-living materials: this property is called actinism and radiation capable of causing such changes is referred to as actinic radiation.
  • The author here suggests the introduction of a useful word, radiance, to express the light, radiant heat, and actinism of the sun, which are evidently modifications of the same form of energy.
  • The germination of seeds in the spring is dependent upon the variations in the amount of actinism or chemical influence of light and heat.

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