diactinicadj.
/dʌɪakˈtɪnɪk/ Optics.
Having the property of transmitting the actinic rays of light.
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diactinic1867
1867 W. A. Miller Elements Chem. (ed. 4) i. 230 Rock-salt, fluor-spar, water..are almost as diactinic..as quartz.
1880 19th Cent. Mar. 529 Substances which are chemically transparent are said to be diactinic.
1880 Athenæum 11 Dec. 781/3 Experiments which prove the diactinic character of substances constructed on an open chain of carbon compounds.
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diˈactinism n. ‘the condition of transparency for chemical or actinic rays’ ( New Sydenham Soc. Lexicon 1883).
This entry has not yet been fully updated (first published 1895; most recently modified version published online March 2018).
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adj.1867