Strong's G4566 — Σατᾶν (Name Person)
Satan (sat-an`) n/p.
1. the Adversary
2. (figuratively) the Accuser
3. "Satan", i.e. the devil
[of Hebrew origin]
KJV: Satan 
Root(s): H7854 
Compare: G4567 
Hebrew root: שָׂטָן