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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).
Also, especially before a vowel, actin-.
Origin
< Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o-
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for actino

actino-

combining form
1.
indicating a radial structure: actinomorphic
2.
indicating radioactivity or radiation: actinometer
Word Origin
from Greek aktino-, from aktis beam, ray
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 Origin and History for actino

actino-

before vowels actin-, word-forming element meaning "pertaining to rays," from Greek aktis (genitive aktinos) "ray, radiance;" perhaps cognate with Sanskrit aktuh "light, ray," Gothic uhtwo "dawn, daybreak," Lithuanian anksti "early."

Online Etymology Dictionary, © 2010 Douglas Harper
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actino in Medicine

actino- or actin-
pref.
Actinic radiation: actinotherapy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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