Definition of actinia in English:

actinia

Pronunciation /akˈtɪnɪə/

noun

Zoology
  • A sea anemone; specifically one of the genus Actinia. Also (in form Actinia): the genus itself.

    Valid publication of the genus name: Linnaeus Systema naturae (ed. 12, 1767) 1088; also used by Pallas (1766) for a genus of holothurian.

Origin

Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From scientific Latin Actinia from ancient Greek ἀκτῖν-, ἀκτίς ray + scientific Latin -ia.