actinoid

Noun
  1. Any of a series of radioactive elements with atomic numbers 89 through 103 (synset 114608290)
    is a type of: group, grouping - any number of entities (members) considered as a unit
    same as: actinide, actinon
Adjective
  1. Having a radial form (synset 302383125)
    "starfish are actinoid--that is, they are radially symmetrical"
    similar to: actinomorphic, actinomorphous - capable of division into symmetrical halves by any longitudinal plane passing through the axis

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