Noun
A Japanese weapon of World War II, consisting of a hydrogen balloon with a bomb attached.
A sky lantern.
Source: en.wiktionary.orgMikesh, pp.1&21 The Japanese fire balloon was the first ever weapon possessing intercontinental range (the second being the Convair B-36 Peacemaker and the third being the R-7 ICBM ). Source: Internet
Includes a personal account by a Japanese woman who worked in one of the fire balloon factories. Source: Internet