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1. Oxford Dictionary

   airfoil

   • IPA[ˈɛːfɔɪl]

   英式

   • n.
     a structure with curved surfaces designed to give the most favourable ratio of lift to drag in flight, used as the basic form of the wings, fins, and horizontal stabilizer of most aircraft; an aerofoil.

   • noun: airfoil, plural noun: airfoils