Is kilo Greek or Latin?

Is kilo Greek or Latin? a Greek combining form meaning “thousand,” introduced from French in the nomenclature of the metric system (kiloliter); on this model, used in the formation of compound words in other scientific measurements (kilowatt).

a Greek combining form meaning “thousand,” introduced from French in the nomenclature of the metric system (kiloliter); on this model, used in the formation of compound words in other scientific measurements (kilowatt).