Strong's G4274 — πρόδρομος (adjective)
prodromos (prod'-rom-os) adj.
1. a runner ahead, i.e. scout
2. (figuratively) precursor, forerunner
[from the alternate of G4390]
KJV: forerunner 
Root(s): G4390 
Hebrew root: προτρέχω
Occurrences: 1