(Geol.) Formed by water or aqueous solution; as, Neptunian rocks.
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.
... that in certain quarters we must look to large instruments alone for new discoveries. It would be useless searching for an ultra-Neptunian planet, or for additional satellites to Uranus or Neptune, or for the materials to determine the rotation periods of these planets with a small telescope. Every observer will find objects suited to the capacity ... — Scientific American Supplement, No. 303 - October 22, 1881 • Various
...
