Ac-tĭn'i-ă, n.

Ac-tĭn'i-ă, n. [N. Lat., from Gr. ἀκτίς, gen. ἀκτῖνος, ray.] (Zoöl.) (a.) An animal of the class of Polyps, and family Actinida. From a resemblance to flowers in form and appearance, they are often called animal-flowers and sea-anemones. [See POLYP.] (b.) A genus in the family Actinida. Dana.