an·he·dral
(ˈ)an-¦hē-drəl
plural anhedrals
aeronautics
: the angle between a downwardly inclined aircraft wing and a horizontal transverse line
The bottom wing had pronounced anhedral; the upper wing, dihedral.—William Hallstead, Air & Space/Smithsonian, Feb/Mar 2000
called also negative dihedral
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Merriam-Webster unabridged
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