Etymology From Charon + -ian, or from the alternative Latin oblique stem Charōnis.
1
Of or relating to Charon.
The Charonian journey will soon be taken.
The Elysian plain, near the Catacombs in Egypt, stood upon the foul Charonian canal: which was so noisome, that every fetid ditch and cavern was from it called Charonian. [...] Pliny speaking of some Charonian hollows in Italy, says that the exhalations were insupportable.1773, Jacob Bryant, A New System, or, an Analysis of Ancient Mythology, volume I, pages 29–30:
2 more examples
[It] possessed the six legs characteristic of Charonian life1940, Edmond Hamilton, Calling Captain Future, page 50:
Although this casts doubt on an intrinsic source for a present-day Charonian atmosphere, it is possible that Elliot & Young's result can be understood if Charon's gravity causes it to collect escaping gas from Pluto.1992, Alan Stern, “The Pluto-Charon System”, in Annual Review of Astronomy and Astrophysics, volume 30, page 225:
Charonian
noun
Etymology From Charon + -ian, or from the alternative Latin oblique stem Charōnis.