Of or pertaining to the ocean or sea. [1913 Webster]
Formed by water or aqueous solution; as, Neptunian rocks. [1913 Webster]
Neptunian races(Ethnol.), the Malay and Polynesian races. --
Neptunian theory(Geol.), the theory of Werner, which referred the formation of all rocks and strata to the agency of water; -- opposed to the Plutonic theory.
, prop. n. Array
One who adopts the Neptunian theory. [1913 Webster]