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white coal

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noun
  1. Informal. water, as of a stream, used for power.

Origin of white coal

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for white coal

white coal

noun
  1. water, esp when flowing and providing a potential source of usable power
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