Definition of "anhedral" []

• Lacking sharp, recognisable crystal faces. (adjective)
• The downward slope of an aircraft’s wing (noun)

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• "The opposite of dihedral is called anhedral, and, of course, refers to a wing that is angled down."
• "Sorry for going off topic, but I would appreciate some more aerodynamics posts: the one on anhedral and dihedral was especially good."
• "All this talk of anhedral and dihedral leads to the question of why one would want use either of these on an aircraft."