ἐπόπτης G2030
epóptēs · ep-op'-tace · Noun Masculine
from ἐπί and a presumed derivative of ὀπτάνομαι; a looker-on:--eye-witness.
1 Occurrence in the King James Bible
2 Peter 1:16For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.