Of or pertaining to Japan, or to the lacquered
work of that country; as, Japan ware.
Japan allspice, a cloverlike plant (Lespedeza striata) from Eastern Asia, useful for fodder, first noticed in the Southern United States about 1860, but now become very general. During the Civil War it was called variously Yankee clover and Rebel clover. Japan land. See Catechu. Japan ink, a kind of writing ink, of a deep, glossy black when dry. Japan varnish, a varnish prepared from the milky juice of the Rhus vernix, a little Japanese wood related to the poison sumac.
Source: Websters Vocabulary