used to denote (1) the grave or the abyss ( Romans 10:7 ; Luke 8:31 ); (2) the deepest part of the sea ( Psalms 69:15 ); (3) the chaos mentioned in Genesis 1:2 ; (4) the bottomless pit, hell ( Revelation 9:1 Revelation 9:2 ; 11:7 ; 20:13 ).

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.