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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)
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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)