From Ancient Greek Ποσειδῶν (Poseidôn).
poseido-
- (astronomy) Relating to Neptune
- Synonym: (Latin equivalent) neptuni-
- Hypernym: planeto-
- helio- (the Sun), hermeo- (Mercury), cythero- (Venus), geo- (the Earth), seleno- (the Moon), areo- (Mars), zeno- (Jupiter), crono- (Saturn), urano- (Uranus), poseido- (Neptune), hadeo- (Pluto)