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Dictionary

actino-

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, esp. before a vowel,actin-.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

actinium series

actinobacillosis

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