vane

From Wiktionary

Pronunciation[change]

Noun[change]

Singular
vane

Plural
vanes

cat-shaped weather vane (1)
  1. A weather vane.
  2. A vane is a wide and thin piece of metal that is mounted along a rotating axis, that is turned by or used to turn a fluid.
    Windmills, propellers, or turbines uses vanes to operate.