actin

a. [ Gr. &unr_;, &unr_;, ray. ] (Zool.) Pertaining to the part of a radiate animal which contains the mouth. L. Agassiz. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. &unr_;, &unr_;, ray. ] (Zool.) An order of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not. [ 1913 Webster ]

a. 1. Operating in any way. [ 1913 Webster ]

2. Doing duty for another; officiating; as, an acting superintendent. [ 1913 Webster ]

‖n.; pl. L. Actiniæ E. Actinias [ Latinized fr. Gr. &unr_;, &unr_;, ray. ] (Zool.) (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. [ 1913 Webster ]

n. 1. any sea anemone or related animal.
Syn. -- actinia, actiniarian [ WordNet 1.5 ]

n. 1. 1 the order comprising sea anemones.
Syn. -- order Actiniaria, Actinaria, order Actinaria [ WordNet 1.5 ]

n. 1. any sea anemone or related animal.
Syn. -- actinia, actinian [ WordNet 1.5 ]

a. Of or pertaining to actinism; as, actinic rays. [ 1913 Webster ]

n. 1. 1 a small Asiatic woody vine bearing many-seeded fruit.
Syn. -- genus Actinidia. [ WordNet 1.5 ]