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Portland cement
Port·land ce·ment or port·land ce·ment


noun 
Definition:
 
limestone and clay cement: a cement that hardens under water, made by burning limestone and clay
[Because a similar color to stone, quarried on the Isle of Portland, S England]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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