• word of the day

    actinoid

    actinoid - Dictionary definition and meaning for word actinoid

    Definition
    (noun) any of a series of radioactive elements with atomic numbers 89 through 103
    Synonyms : actinide , actinon
    Definition
    (adj) having a radial form
    Example Sentence
    • starfish are actinoid--that is, they are radially symmetrical
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