1. the smallest of the four main islands of Japan; to the south of Honshu and to the east of Kyushu; separated from Honshu by the Inland Sea; forested and mountainous;
WordNet (r) 3.0 (2006):
Shikoku
n 1: the smallest of the four main islands of Japan; to the
south of Honshu and to the east of Kyushu; separated from
Honshu by the Inland Sea; forested and mountainous