Strong's G749 — ἀρχιερεύς (noun)
archiereus (ar-khee-er-yuce') n.
1. the high-priest
2. (literally) of the Jews
3. (typically) Christ
4. (by extension) a chief priest
[from G746 and G2409]
KJV: chief (high) priest, chief of the priests 
Root(s): G746, G2409 
Hebrew root: ἱερεύς
Occurrences: 122