Dictionary/島内とうないTounai島内 (Tounai) is a Japanese noun meaning “on an island, on-island”.Meaningsnoun, adjectival nounon an island; on-islandKanji in 島内島island内insideRelated words内inside内within ...区内in a ward内科internal medicine島island内容contents案内guidance内緒secrecyその内before very longこの内among these以内within中島island in a pond or river