noun
a taxonomic group of sea anemones and corals characterized by having stinging cells called nematocysts
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The Actinoida is an order of marine animals that includes sea lilies and feather stars.
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Have you ever seen those cool sea lilies? They belong to the Actinoida group.
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Those funky sea creatures that look like plants? Yeah, they're part of the Actinoida gang.
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The Actinoida group moves gracefully in the ocean, resembling dancers in a synchronized routine.