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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典


From: Webster's Revised Unabridged Dictionary (1913)

 Ac·tin·oid a.  Having the form of rays; radiated, as an actinia.

From: WordNet (r) 2.0

      adj : having a radial form; "starfish are actinoid--that is, they
            are radially symmetrical"
      n : any of a series of radioactive elements with atomic numbers
          89 through 103 [syn: actinide, actinon]