1) Coelenterate genus 2) Genus actinia 3) Sea anemone 
Actinia is a genus of sea anemones in the family Actiniidae. The following species are listed in the World Register of Marine Species (WoRMS): ...
• (n.) An animal of the class Anthozoa, and family Actinidae. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.]. • (n.) A genus in the family Actinidae.
Ac·tin'i·a noun ; plural Latin Actiniæ English Actinias [ Latinized from Greek ..., ..., ray.] (Zoology) (a) An animal of the class Anthozoa, and family Actinidæ . From a resemblance to flowers in form and color, they are often called animal fl...
Actinia is a member of the order Zoantharia.
[n] - a genus of sea anemone common in rock pools 2. [n] - any sea anemone or related animal
genus Actinia noun a genus of sea anemone common in rock poolsactiniarian noun any sea anemone or related animal
a sea anemone, esp. of the genus Actinia.