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-.

< Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actino- or (before a vowel) actin-
combining form
1.  indicating a radial structure: actinomorphic
2.  indicating radioactivity or radiation: actinometer
[from Greek aktino-, from aktis beam, ray]
actin- or (before a vowel) actin-
combining form
[from Greek aktino-, from aktis beam, ray]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

actino- or actin-
Actinic radiation: actinotherapy.

The American Heritage® Stedman's Medical Dictionary
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