portland cement Hear it!

portland cement definition

port·land cement (pôrt′lənd)

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

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

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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