Roosevelt Island(redirected from Blackwell Island)
1. An island in the East River off the coast of central Manhattan Island. It was long the site of a penal institution and municipal hospital, which earned it the name Welfare Island after 1921. Renamed for Franklin D. Roosevelt in 1973, it is now largely residential.
2. An island of Antarctica in the eastern part of the Ross Ice Shelf. Robert E. Byrd discovered the island in 1934.