Gorgonian

Part of speech: noun (n.)

One of the Gorgoniacea.

Part of speech: adjective (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. Pertaining to the Gorgoniacea; as, gorgonian coral.