a groove cut in masonry to receive flashing.
Also called raggle block. a manufactured masonry unit, usually of terra cotta, having a groove for receiving flashing.
Origin of raggle
First recorded in 1880–85; origin uncertain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
mainly Scot a thin groove cut in stone or brickwork, esp to hold the edge of a roof
Word Origin for raggle
C19: of obscure origin
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