Actinoid

Noun1.actinoid - any of a series of radioactive elements with atomic numbers 89 through 103
group, grouping - any number of entities (members) considered as a unit
Adj.1.actinoid - having a radial form; "starfish are actinoid--that is, they are radially symmetrical"
actinomorphic, actinomorphous - capable of division into symmetrical halves by any longitudinal plane passing through the axis

 

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