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actino-

  1. a combining form with the meaning “ray, beam,” used in the formation of compound words, with the particular senses “radiation” in the physical sciences ( actinometer ) and “having raylike structures,” “radiate in form” in biology ( actinomyces; actinopod ).


actino-

combining_form

  1. indicating a radial structure

    actinomorphic

  2. indicating radioactivity or radiation

    actinometer

“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


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Word History and Origins

Origin of actino-1

< Greek, combining form representing aktī́s (genitive aktînos ) ray, beam; -o-
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Word History and Origins

Origin of actino-1

from Greek aktino-, from aktis beam, ray

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actinium seriesactinobacillosis