Strong's G845 — αὐτόπτης (adjective)
autoptes (au-top'-tace) adj.
1. self-seeing, i.e. an eye-witness
[from G846 and G3700]
KJV: eye-witness 
Root(s): G846, G3700 
Hebrew root: ὀπτάνομαι
Occurrences: 1