vane /ˈven/
 風向標,風信旗,變化不定的事物


 Vane n.
 1. A contrivance attached to some elevated object for the purpose of showing which way the wind blows; a weathercock.  It is usually a plate or strip of metal, or slip of wood, often cut into some fanciful form, and placed upon a perpendicular axis around which it moves freely.
    Aye undiscreet, and changing as a vane.   --Chaucer.
 2. Any flat, extended surface attached to an axis and moved by the wind; as, the vane of a windmill; hence, a similar fixture of any form moved in or by water, air, or other fluid; as, the vane of a screw propeller, a fan blower, an anemometer, etc.
 3. Zool. The rhachis and web of a feather taken together.
 4. One of the sights of a compass, quadrant, etc.
 Vane of a leveling staff. Surv. Same as Target, 3.

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 vane
      n 1: flat surface that rotates and pushes against air or water
           [syn: blade]
      2: mechanical device attached to an elevated structure; rotates
         freely to show the direction of the wind [syn: weathervane,
          weather vane, wind vane]
      3: a metal fin attached to the tail of a bomb or missile in
         order to stabilize or guide it
      4: the flattened weblike part of a feather consisting of a
         series of barbs on either side of the shaft [syn: web]