Definition of Portland cement noun from the Oxford Advanced Learner's Dictionary

 

Portland cement

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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the most common type of cement used today, made from chalk and clay. It was invented in England in the early 19th century. When it is hard its colour is like that of Portland stone, a type of stone from the Isle of Portland in Dorset used to make grand buildings such as St Paul's Cathedral.