Definition of Neptonian

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.

{ Nep*tu"ni*an (?), Nep"tu*nist (?) }, n. [Cf. F. neptinien, neptuniste.] (Geol.) One who adopts the Neptunian theory.

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