barbarians; foreigners
Historical term used in pre-modern East Asian contexts to refer to non-Chinese or non-civilized peoples, often with a derogatory nuance. In modern Japanese, it is rarely used except in historical discussions or literary works.
In ancient China, surrounding ethnic groups were called barbarians.
This history book describes the customs of the barbarians in detail.
From Chinese 夷狄 (yídí), a compound of 夷 (eastern barbarians) and 狄 (northern barbarians). The term was adopted into Japanese with the same historical and derogatory sense.