Might mean (unverified): Elements in the actinide series.
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  1. actinioidean: Wiktionary

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Definitions from Wiktionary (actinioidean)

▸ noun:  Any sea anemone of the superfamily Actinioidea

Similar:
actinarian, actiniid, actiniarian, actinian, actinostolid, actiniarid, actinia, actinocyclid, actinoptygian, sea anemone, more...

Opposite:
non-actinide, non-actinoid

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Similar:
actinarian, actiniid, actiniarian, actinian, actinostolid, actiniarid, actinia, actinocyclid, actinoptygian, sea anemone, more...

Opposite:
non-actinide, non-actinoid



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