NEPTUNIANa.
[the fabled deity of the ocean.]
1. Pertaining to the ocean or sea.
2. Formed by water or aqueous solution; as Neptunian rocks.
NEPTUNIANn.
One who adopts the theory that the whole earth was once covered with water, or rather that the substances of the globe were formed from aqueous solution; opposed to the Plutonic theory.