'Neptunian theory' definitions:

Definition of 'Neptunian theory'

From: GCIDE
  • Neptunian \Nep*tu"ni*an\, prop. a. [L. Neptunius belonging to Neptune: cf. F. neptunien.]
  • 1. Of or pertaining to the ocean or sea. [1913 Webster]
  • 2. (Geol.) 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. [1913 Webster] Neptunian