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See more synonyms for diactinic on Thesaurus.com
adjective Physics.
  1. capable of transmitting actinic rays.
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Origin of diactinic

First recorded in 1865–70; di-3 + actinic
Related formsdi·ac·tin·ism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for diactinic

Historical Examples

  • Diactinic, dī-ak-tin′ik, adj. capable of transmitting the actinic rays of the sun.

    Chambers's Twentieth Century Dictionary (part 1 of 4: A-D)


British Dictionary definitions for diactinic


  1. physics able to transmit photochemically active radiation
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Derived Formsdiactinism, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012