Etymology

neptunian

Nep·tun·i·an
N1E1P3T1U1N1I1A1N1

Today it means: Of or pertaining to Neptune, the Roman god of fresh water and the sea, the counterpart of the Greek god Poseidon. Full definition →

Latin Neptūnius ← Proto-Indo-European *nebʰ-
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Neptunian · adjective, noun1

  1. Proto-Indo-European · derived from*nebʰ-“to become damp, cloudy”
  2. Latin · derived fromNeptūnius“of or pertaining to the Roman god Neptune”
  3. English todayNeptunian

From Latin Neptūnius (“of or pertaining to the Roman god Neptune”), from Neptūnus (“the Roman god Neptune”) (possibly ultimately from Proto-Indo-European *nebʰ- (“to become damp, cloudy”)) + -ius (suffix forming adjectives from nouns); analysable as Neptune + -ian. The English word is cognate with French neptunien (“pertaining to the Roman god Neptune, pertaining to the sea, pertaining to Neptunism, Neptunian; proponent of Neptunism, Neptunist”), German Neptunier (“proponent of Neptunism, Neptunist”).

Neptunian · adjective, noun2

From Neptune (“eighth planet in the solar system”) + -ian.

Etymology from Wiktionary, CC BY-SA 4.0.