Definition of actinoid

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  • actinoid is a valid Scrabble US word with a point value of 11
  • actinoid is a valid Scrabble UK word with a point value of 11
  • actinoid is a valid Words with friends word with a point value of 13

Definition of actinoid

  • any of a series of radioactive elements with atomic numbers 89 through 103 (noun)

    Synonyms

    1. actinide
    2. actinon
  • having a radial form (adjective)

    Examples

    1. starfish are actinoid--that is, they are radially symmetrical

See definition of actinoid in Merriam Webster