||Ac`ti*na"ri*a (&?;), n. pl. [NL., from Gr. &?;, &?;, ray.] (Zoöl.) A large division 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.