Gor·go·ni·an a.
  1. Pertaining to, or resembling, a Gorgon; terrifying into stone; terrific.
  The rest his look
  Bound with Gorgonian rigor not to move.   --Milton.
  2. Zool. Pertaining to the Gorgoniacea; as, gorgonian coral.
  Gor·go·ni·an, n. Zool. One of the Gorgoniacea.
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  gorgonian
       n : corals having a horny of calcareous branching skeleton [syn:
            gorgonian coral]