English dictionary



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English adjective: actinoid

1. actinoid having a radial form


SamplesStarfish are actinoid--that is, they are radially symmetrical.


Similaractinomorphic, actinomorphous


Antonymsbilaterally symmetrical, zygomorphic, zygomorphous


English noun: actinoid

1. actinoid (substance) any of a series of radioactive elements with atomic numbers 89 through 103


Synonymsactinide, actinon


Broader (hypernym)group, grouping









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