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Portland cement

noun
1.
a type of hydraulic cement usually made by burning a mixture of limestone and clay in a kiln.
Also, portland cement.
Origin
1815-1825
1815-25; named after the Isle of Portland, Dorsetshire, England
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for portland-cement

Portland cement

noun
1.
a cement that hardens under water and is made by heating a slurry of clay and crushed chalk or limestone to clinker in a kiln
Word Origin
C19: named after the Isle of Portland, because its colour resembles that of the stone quarried there
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
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