Nep*tu"ni*an (?), a. [L. Neptunius belonging to Neptune: cf. F. neptunien.]
1.
Of or pertaining to the ocean or sea.
2. 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.
© Webster 1913.
Nep*tu"ni*an (?), Nep"tu*nist (?), n. [Cf. F. neptinien, neptuniste.] Geol.
One who adopts the neptunian theory.
© Webster 1913.