Pronunciation: (nep-tOO'nē-un, -tyOO'-), Strict Standards: Non-static method FenSites::linkTo() should not be called statically in /site/html/dictionary/neptunian.html on line 77 [key]
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.