Webster's Revised Unabridged Dictionary · 1913

Actinaria

Actinaria ({not transcribed}) , noun, plural

[New Latin, from Greek {not transcribed}, {not transcribed}, ray.]

(Zoology) 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.