Definition of actinian in English:

actinian

noun

Zoology
  • A sea anemone.

    • ‘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.’
    • ‘It has been seen that varying temperatures have a dramatic effect on the growth rates of some actinians.’
    • ‘However, actinians, like all coelenterates, capture and digest animal prey with their nematocysts.’
    • ‘Cold-water coral mound dominated by Lophelia pertusa and colonised by orange actinians and a white anthipathrian.’

Origin

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

Pronunciation:

actinian

/akˈtɪnɪən/