From The Collaborative International Dictionary of English v.0.48 [gcide]:
Alcyonium \Al'cy*o"ni*um\, noun [Gr. ? a zo["o]phyte, so called from being like the halcyon's nest.] (Zool.) A genus of fleshy Alcyonaria, its polyps somewhat resembling flowers with eight fringed rays. The term was also formerly used for certain species of sponges.
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