What does actinia mean?
The definition of actinia
Ac*tin”i*a, n.; pl. L. Actiniæ, E. Actinias.
Etym: [Latinized fr. Gr. (Zoöl.)
(a) An animal of the class Anthozoa, and family Actinidæ. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.].
(b) A genus in the family Actinidæ.