Note 398 — Chapter IV · THE WOMEN’S FESTIVALS. Thesmophoria, Arrephoria, Skirophoria, Stenia, Haloa.
Reading edition
Lyd. de mens. IV. 38 Μυστήρια ἀπὸ τῆς στερήσεως τοῦ μύσους ἀντὶ τῆς ἁγιοσύνης. In form μύστης might come from μύω (cf. ἀμυστί), but Mr Gilbert Murray draws my attention to some uses of μυστήριον which point rather to μύσος, e.g. Eur. Suppl. 470 λύσαντα σεμνά στεμμάτων μυστήρια and El. 87 ἐκ θεοῦ μυστηρίων.