琉りゅう球きゅう国こくMeanings1nounRyukyu Kingdomhistorical termHistorical term for the kingdom that ruled the Ryukyu Islands from the 15th to 19th century, before becoming Okinawa Prefecture.琉りゅう球きゅう国こくは中ちゅう国ごくや日本にほんと交こう易えきを行おこなっていた。The Ryukyu Kingdom traded with China and Japan.