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flaunch

British  
/ flɔːntʃ /

noun

  1. Also called: flaunching.  a cement or mortar slope around a chimney top, manhole, etc, to throw off water

"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

Etymology

Origin of flaunch

C18: variant of flange