ἑταιρεῖον

From LSJ

τέλος δεδωκώς Xθύλου, σoι χάριν φέρω → having given the end of Cthulhu, I confer a favor on you

Source

German (Pape)

[Seite 1046] τό, ein Hurenhaus, Schol. Ar. Equ. 873.