actinia
noun
ac·tin·ia
ak-ˈti-nē-ə
1
capitalized in some classifications
: a genus of sea anemones nearly coextensive with the order Actiniaria
2
plural actiniae
ak-ˈti-nē-ˌē
or actinias
: any sea anemone or related animal
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Merriam-Webster unabridged
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