Definition of actinian in English:

actinian

Syllabification: ac·tin·i·an
Pronunciation: /akˈtinēən
 
/

noun

Zoology
A sea anemone.
More example sentences
  • However, actinians, like all coelenterates, capture and digest animal prey with their nematocysts.
  • Even on reefs, most species of host actinians are inconspicuous, unlike their partner fish.
  • The larger, more conspicuous include other species of cold-water coral, actinians and sponges.

Origin

mid 18th century: from the modern Latin genus name Actinia (from Greek aktis, aktin- 'ray') + -an.

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