Dictionary

Deep

Easton's Dictionary

Used to denote (1) the grave or the abyss (Rom. 10:7; Luke 8:31); (2) the deepest part of the sea (Ps. 69:15); (3) the chaos mentioned in Gen. 1:2; (4) the bottomless pit, hell (Rev. 9:1, 2; 11:7; 20:13).

International Standard Bible Encyclopedia

(tehom; abussos, Lu 8:31 the King James Version; Ro 10:7 the King James Version; bathos, Lu 5:4; buthos, 2Co 11:25):

The Hebrew word ("water in commotion") is used

(1) of the primeval watery waste (Ge 1:2), where some suggest a connection with Babylonian Tiamat in the creation-epic;

(2) of the sea (Isa 51:10 and commonly);

(3) of the subterranean reservoir of water (Ge 7:11; 8:2; 49:25; De 33:13; Eze 31:4, etc.). In the Revised Version (British and American) the Greek word first noted is rendered, literally, "abyss." See ABYSS; also ASTRONOMY, sec. III, 7.