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limescale

noun
  1. a flaky deposit left in containers such as kettles by the action of heat on water containing calcium saltsOften shortened to: scale
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Word Origin for limescale

from lime 1 (sense 1) + scale 1 (sense 3)
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