和わ同どう開かい珎ちんalso: わどうかいほうわどうかいちんMeanings1nounWadōkaichin; Japan's first circulated coinagehistorical termHistorical term for the first widely circulated coin in Japan, minted in 708 CE. Often mentioned alongside 和同開珎 and 富本銭.See also: 和銅 · 富本銭和わ同どう開かい