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Wiktionary
wokou

n. (context historical English) Japanese pirates who raided Japan's neighbours in the Late Middle Ages.

Wikipedia
Wokou

Wokou (; Japanese: Wakō; Korean: 왜구 Waegu), which literally translates to "Japanese pirates" or "dwarf pirates", were pirates who raided the coastlines of China, Japan and Korea. Wokou came from a mixture of ethnicities.

The term wokou is a combination of (倭), referring to either dwarfs or pejoratively to the Japanese, and kòu "bandit".