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Superfortress

[soo-per-fawr-tris]
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noun U.S. Military.
  1. a heavy, long-range, four-engined bomber used during World War II.
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Origin of Superfortress

Also called B-29, Su·per·fort [soo-per-fawrt, -fohrt] /ˈsu pərˌfɔrt, -ˌfoʊrt/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018