Strong’s Greek
G1482 — ethnikos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἐθνικός
ethnikos — pronounced eth-nee-kos'
from 1484; national ("ethnic"), i.e. (specially) a Gentile:--heathen (man). see GREEK for 1484
2 occurrences in the KJV.
Matthew 6:7
But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
Matthew 18:17
And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.