*actinaria*

‖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 ]