Actinia

from WordNet (r) 3.0 (2006)

Actinia
    n 1: a genus of sea anemone common in rock pools [syn:
         {Actinia}, {genus Actinia}]
    2: any sea anemone or related animal [syn: {actinia},
       {actinian}, {actiniarian}]

from The Collaborative International Dictionary of English v.0.48

Actinia \Ac*tin"i*a\, n.; pl. L. {Actini[ae]}, E. {Actinias}.
   [Latinized fr. Gr. ?, ?, ray.] (Zool.)
      (a) An animal of the class Anthozoa, and family
          {Actinid[ae]}. 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 {Actinid[ae]}.
          [1913 Webster]