Abyss (from Greek ἄβυσσος = "bottomless", "the bottomless pit") may mean: Sciences and philosophy Abyssal zone, a deep extent of the sea. Abyssal plain, a flat area on the ocean floor Abyss (religion),'s a bottomless depth. Abyss (Thelema), a spiritual principle within the system of Thelema. Literature The Abyss (novel), a historical novel by Marguerite Yourcenar, alternatively known as Zeno of Bruges The Abyss, a horror novel by Robert A. W. Lowndes… (More on Abyss)