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Thesaurus: actinoid

Having the form of rays; radiated, as an actinia.

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  1. a. Having the form of rays; radiated, as an actinia.
  2. adj. having a radial form
  3. n. any of a series of radioactive elements with atomic numbers 89 through 103
  4. n. any of a series of radioactive elements with atomic numbers 89 through 103 s. having a radial form