Strong's G899 — βάθος (noun)
bathos (bath'-os) n.
1. great depth
2. (of intellect) deep, profound matters
3. (by implication) extent
4. (figuratively) mystery
[from the base of G939]
KJV: deep(-ness, things), depth 
Root(s): G939 
Compare: G901 
Hebrew root: βάσις
Occurrences: 8