initials of Franklin DelanoRoosevelt, (1882 - 1945) thirty-second president of the US from 1933 to 1945. During World War II (1939 - 1945), Roosevelt began the research project which produced the atomic bomb, a weapon that after his death brought a quick but highly controversial end to the war. He died a few weeks before Germany surrendered and before the end of the war with Japan. —SHSBC Binder 29 Approved Glossary