The eight great naraka, or hot hells: (1) sañjīva 等活 hell of rebirth into (2) kāla-sūtra 黑繩, i.e. the hell of black cords or chains; (3) saṅghāta 衆合, in which all are squeezed into a mass between two mountains falling together; (4) raurava 號呌; hell of crying and wailing; (5) mahāraurava 大號呌 hell of great crying; (6) tapana 炎熱　hell of burning; (7) pratāpana 大熱 hell of fierce heat; (8) avīci 無間 unintermitted rebirth into its sufferings with no respite. v.　地獄 and 八寒地獄.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

八個大地獄。地獄大約分為三大類，即根本地獄、近邊地獄、孤獨地獄。在根本地獄中，又分為縱橫兩大類，縱的有八大地獄，又稱為八熱地獄。橫的也有八大地獄，又稱為八寒地獄。

陳義孝編, 竺摩法師鑑定, 《佛學常見辭彙》