Portland cement

a type of hydraulic cement usually made by burning a mixture of limestone and clay in a kiln.
Also, portland cement.

1815–25; named after the Isle of Portland, Dorsetshire, England

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World English Dictionary
Portland cement
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
[C19: named after the Isle of Portland, because its colour resembles that of the stone quarried there]

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