(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 the definition of deep in the KJV Dictionary