Abyssus, abyssi, f. g. A deapenesse without bottome.
Lewis and Short: Latin dictionary
ăbyssus, i, f., = a)/bussos (sc. li/mnh). 1.A bottomless pit, an abyss, Isid. Orig. 13, 20.—2.The sea, Vulg. Gen. 1, 2.—3.The place of the dead, Orcus, Hades, Vulg. Rom. 10, 7.—4.Tartarus, hell, where the wicked are confined, Vulg. Luc. 8, 31; ib. Apoc. 9, 1. So in eccl. Lat.