Definition of vane noun from the Oxford Advanced Learner's Dictionary

 

vane

 noun
noun
BrE BrE//veɪn//
 
; NAmE NAmE//veɪn//
 
 
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a flat blade that is moved by wind or water and is part of the machinery in a windmill, etc. The windmill’s sails are wooden vanes whose angle can be adjusted from inside the mill. see also weathervane Word Origin late Middle English: dialect variant of obsolete fane ‘banner’, of Germanic origin.
See the Oxford Advanced American Dictionary entry: vane