The Collaborative International Dictionary of English v.0.48:

Gorgonia \Gor*go"ni*a\ (g[^o]r*g[=o]"n[i^]*[.a]), n. [L., a
   coral which hardens in the air.] (Zool.)
   1. A genus of Gorgoniacea, formerly very extensive, but now
      restricted to such species as the West Indian sea fan
      (Gorgonia flabellum), sea plume (G. setosa), and other
      allied species having a flexible, horny axis.
      [1913 Webster]

   2. Any slender branched gorgonian.
      [1913 Webster]