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English word actinic comes from English -ic, Ancient Greek ἀκτίς
-ic (English)
(chemistry) Used to denote certain chemical compounds in which a specified chemical element has a higher oxidation number than in the equivalent compound whose name ends in the suffix -ous. For example sulphuric acid (H₂SO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).. Used to form adjectives from nouns with the meaning “of or pertaining to”.
ἀκτίς (Ancient Greek)
actinic (English)
Composed of actin.. Of or relating to actinism.. Related to or caused by light or radiation. In medicine, actinic keratoses usually occur in sundamaged skin and exhibit hyperkeratosis.