actinia

From translingual Actinia (genus name).

actinia (plural actinias or actiniae)

1. A sea anemone, specifically a member of the genus Actinia. [from 18th c.]
   • 1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, page 121:

     The Abbe Dicquemarre has further elucidated the history of the actinia; and observed their manner of taking their prey by inclosing it in these beautiful rays like a net.

   • 1869, Cooke (editor), Hardwicke's Science-Gossip, page 205:

     Cut off the tentacles of an actinia, and they are replaced in a short time, and the experiment may be repeated indefinitely.

actīnia

1. nominative/accusative/vocative plural of actīnium