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guide vanes

British  

plural noun

  1. fixed aerofoils that direct air, gas, or water into the moving blades of a turbine or into or around bends in ducts with minimum loss of energy

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012