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superfortress
superfortress n. 
/ˈsjuːpəˌfɔːtrᵻs/,
Brit. /ˈsuːpəˌfɔːtrᵻs/
, /ˈsuːpəˌfɔːtrᵻs//ˈsjuːpəˌfɔːtrᵻs/U.S. /ˈsupərˌfɔrtrəs/
(a) a very large and heavily defended fortress; (b) a bomber aeroplane larger and more technically advanced than the Boeing B-17 ‘flying fortress’ (cf. flying fortress n. at flying n. Additions); spec. (an informal name for) the Boeing B-29 long-range heavy bomber aeroplane developed in the early 1940s./ˈsupərˌfɔrtrəs/ΚΠ
1916 Manch. Guardian 24 Nov. 5/3 They were super-fortresses defended by large garrisons as heavily armed and munitioned as the men wished.
1938 Joplin (Missouri) Globe 22 Apr. a1/5 The army's famous ‘flying fortress’ is available for export. The army's faster, more lethal super-fortress is not.
1982 Pop. Mech. Dec. 127/1 Though subsequently replaced by the even more awesome B-29 Superfortress, the B-17 was a marvelous flying machine.
2010 D. Brown Executive Intent ii. 83 Although Wenchang was the main target of this mission, the Grebe drone also snapped a few pictures of the rest of the island superfortress.
2011 G. G. Loving Bully Able Leader xi. 122 Known as the Superfortress, the B-29 was a huge airplane with a wingspan of 141 feet and a crew of eleven.
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