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noun
Any of a series of radioactive elements with atomic numbers 89 through 103.
synonyms: actinide, actinon.
is a specific kind of: group, grouping.
Dutch: actinidePolish: aktynowiec
adjective
Having a radial form.
is similar to: actinomorphic, actinomorphous.
Find more on actinoid elsewhere: etymology - rhymes - Wikipedia.
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