Neptunian adjective & noun. [nɛp'tju:nɪǝn] Also neptunian, (rare) Neptunean. M17.
[from Latin Neptunius, from Neptunus (see NEPTUNE), + -IAN.]
A. adjective.
1. Of or pertaining to the Roman sea-god Neptune; of or pertaining to the sea. M17.

2. Geology.
a. = NEPTUNIC. L18.
Neptunian dyke a deposit of sand cutting through sedimentary strata in the manner of an igneous dyke, formed by the filling of an underwater fissure.
b. Pertaining to, of the nature of, or advocating Neptunism. E19.

3. Of or belonging to the planet Neptune. M19.
b. noun.
1. Geology. = NEPTUNIST 2. L18.

2. An (imaginary or hypothetical) inhabitant of the planet Neptune. L19.

■ Neptunianism noun = NEPTUNISM M19.

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