Strong's G12 — ἄβυσσος (noun)
abussos (ab'-us-sos) n.
1. depthless
2. (specially) infernal "abyss"
[from G1 (as a negative particle) and a variation of G1037]
KJV: deep, (bottomless) pit 
Root(s): G1, G1037 
See also: G5421 
Hebrew root: βυθός
Occurrences: 9