vane 
/ˈveɪn/ noun
plural vanes /ˈveɪn/ noun [count] 1 : weather vane 2 : a thin, flat or curved object that is attached to a wheel and that moves when air or water pushes it
▪ the vanes of a windmill — see picture at windmill
▪ the vanes of a windmill — see picture at windmill
