Windmill Wings

Windmill

A windmill is a machine operated by the force of wind acting on vanes or sails to mill grain (gristmills). Windmills were used throughout the high medieval and early modern periods; the horizontal or panemone windmill first appeared in Persia during the 9th century, and the vertical windmill first appeared in northwestern Europe in the 12th century.

Wing

A wing is a structure which produces both lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform. Wing efficiency is expressed as lift-to-drag ratio, which compares the benefit of lift with the air resistance of a given wing shape, as it flies. Aerodynamics includes the study of wing performance in air.

windmill

Noun

1. A machine which translates linear motion of wind to rotational motion by means of adjustable vanes called sails.
2. The building or structure containing such machinery.

Verb

1. To rotate with a sweeping motion.
2. To (become disengaged and) rotate freely.

wings

Noun

1. plural of wing

Noun

1. A type of scuba harness with an attached buoyancy compensation device: see wikipedia:Backplate and wing
2. A flip (hairstyle).