vane

Vane is usually short for “weathervane.” If the vane on top of the building is spinning, it must be windy outside.

In addition to being a device that shows you the direction of the wind, a vane can help direct flying things through the wind, as bird lovers and archers, among others, know. Be careful not to mistake vane for its homonyms, vein and vain. If you're so vain that you'll slash at your veins if the wind messes up your hair, check the vane before going out. Or just wear a hat.

Definitions of vane
1

n the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft

Synonyms:
web
Type of:
blade
a broad flat body part (as of the shoulder or tongue)

n mechanical device attached to an elevated structure; rotates freely to show the direction of the wind

Synonyms:
weather vane, weathervane, wind vane
Types:
weathercock
weathervane with a vane in the form of a rooster
wind tee
weather vane shaped like a T and located at an airfield
Type of:
mechanical device
mechanism consisting of a device that works on mechanical principles

n flat surface that rotates and pushes against air or water

Synonyms:
blade
Types:
show 4 types...
hide 4 types...
fan blade
blade of a rotating fan
impeller
the blade of a rotor (as in the compressor of a jet engine)
paddle
a blade of a paddle wheel or water wheel
rudder blade
the vertical blade on a rudder
Type of:
rotating mechanism
a mechanism that rotates

n a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it

Type of:
fin
a stabilizer on a ship that resembles the fin of a fish

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