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sweptback

[swept-bak]
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adjective Aeronautics.
  1. (of the leading edge of an airfoil) forming a markedly obtuse angle with the fuselage.
  2. (of an aircraft or winged missile) having wings of this type.

Origin of sweptback

First recorded in 1915–20; adj. use of verb phrase swept back
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for sweptback

sweptback

adjective
  1. (of an aircraft wing) having leading edge and trailing edges inclined backwards towards the rear of the fuselage
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012