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Origin of actinic

First recorded in 1835–45; actin- + -ic
Related formsac·tin·i·cal·ly, adverbnon·ac·tin·ic, adjectivenon·ac·tin·i·cal·ly, adverbun·ac·tin·ic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for actinic

synthetic, actinic, alchemical, enzymatic, synthetical

Examples from the Web for actinic

Historical Examples of actinic

British Dictionary definitions for actinic


  1. (of radiation) producing a photochemical effect
Derived Formsactinically, adverbactinism, noun

Word Origin for actinic

C19: from actino- + -ic
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

actinic in Medicine


  1. Of or relating to the chemically active rays of the electromagnetic spectrum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.