Strong’s Greek
G2030 — epoptes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἐπόπτης
epoptes — pronounced ep-op'-tace
from 1909 and a presumed derivative of 3700; a looker-on:--eye-witness. see GREEK for 1909 see GREEK for 3700
1 occurrence in the KJV.
2 Peter 1:16
For 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.