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Definition of Actino-
1. Prefix. (biology) Used to form the terms relating to organisms etc. that have a radial form ¹
2. Prefix. (physics) Used to describe terms related to actinic radiation ¹
¹ Source: wiktionary.com
Medical Definition of Actino-
1. Combining form meaning a ray, as of light; applied to any form of radiation or to any structure with radiating parts. See: radio-. Origin: G. Aktis, aktinos, a ray of light, a beam. (05 Mar 2000)