E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The river of Hate, called by Milton abhorrëd Styx, the flood of burning hate (Paradise Lost, ii. 577). It was said to flow nine times round the infernal regions. (Greek, stugeo, hate.)
The Styx is a river of Egypt, and the tale is that Isis collected the various parts of Osris (murdered by Typhon) and buried them in secrecy on the banks of the Styx. The classic fables about the Styx are obviously of Egyptian origin. Charon, as Diodrus informs us, is an Egyptian word for a ferryman, and styx means hate.