(n) the central and largest of the four main islands of Japan; between the Sea of Japan and the Pacific Ocean; regarded as the Japanese mainland, Syn. Hondo
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
prop. n. [ Jap. ] the main island of Japan. Together with the islands of Hokkaido, Kyushu and Shikoku it forms the bulk of the land area of Japan. [ WordNet 1.5 ]