actinoid(redirected from Actinoids)
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(Zoology) having a radiate form, as a sea anemone or starfish
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|Noun||1.||actinoid - any of a series of radioactive elements with atomic numbers 89 through 103|
|Adj.||1.||actinoid - having a radial form; "starfish are actinoid--that is, they are radially symmetrical"|