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  1. actinic

    • IPA[akˈtɪnɪk]

    英式

    • adj.
      (of light or lighting) able to cause photochemical reactions, as in photography, through having a significant short wavelength or ultraviolet component.
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    • IPA[akˈtinik]

    美式

    • adj.
      relating to or denoting light able to cause photochemical reactions, as in photography, through ...

    Oxford American Dictionary