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单词 portland cement
释义

WordReference Random House Unabridged Dictionary of American English © 2024
Portland cement, 
  1. Building, Chemistrya type of hydraulic cement usually made by burning a mixture of limestone and clay in a kiln.
Also, portland cement. 
  • named after the Isle of Portland, Dorsetshire, England 1815–25

Collins Concise English Dictionary © HarperCollins Publishers::
Portland cement n
  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
Etymology: 19th Century: named after the Isle of Portland, because its colour resembles that of the stone quarried there
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