Dictionary![]() ![]() Nep•tu•ni•anPronunciation: (nep-tOO'nē-un, -tyOO'-), [key] —adj. 1. pertaining to Neptune or the sea. 2. pertaining to the planet Neptune. 3. (often l.c.) Geol.formed by the action of water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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