sweepback

Sweepback is the backward angle of the front portion an airplane's wing.

(noun)

An example of a sweepback is the slant of an airplane wing or a whale fin.

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See sweepback in Webster's New World College Dictionary

noun

  1. a backward slant of an airfoil, esp. of a wing
  2. the angle formed by some reference line along an airplane wing and the lateral axis of the airplane

See sweepback in American Heritage Dictionary 4

noun
The backward slant of the leading edge of an airfoil.
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