Strong's #1482: ethnikos (pronounced eth-nee-kos')
from 1484; national ("ethnic"), i.e. (specially) a Gentile:--heathen (man).
Thayer's Greek Lexicon:
1) adapted to the genius or customs of a people, peculiar to a people, national
2) suited to the manners or language of foreigners, strange, foreign
3) in the NT savouring of the nature of pagans, alien to the worship of the true God, heathenish
3a) of the pagan, the Gentile
Part of Speech: noun masculine
Relation: from G1484
Citing in TDNT: 2:372, 201
This word is used 2 times:
Matthew 6:7: "use not vain repetitions, as the heathen do: for they think that"
Matthew 18:17: "let him be unto thee as a heathen man and a publican."