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Definition of: Neptunian
(nep·t
′nē·ən, -ty′-) adjective
1. Of or pertaining to Neptune or his domain, the sea.
2. Geol. a Formed in or by the agency of water: said of rocks, b Of or pertaining to the theory of the aqueous origin of certain rocks: opposed to the Plutonic theory.
—Nep′tun·ist adjective & noun
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