portland cement

(pôrt′lənd)

a kind of cement that hardens under water, made by burning a mixture of limestone and clay or similar materials

Origin: from resemblance of the concrete made from it to stone quarried on the Isle of Portland, England

See portland cement in American Heritage Dictionary 4

or portland cement

noun

A hydraulic cement made by heating a limestone and clay mixture in a kiln and pulverizing the resulting material.

Origin:

Origin: After Portland, an urban district of southern England

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