Portland cement
noun
Port·land cement
ˈpȯrt-lən(d)-
variants
or less commonly portland cement
: a cement (see cement entry 1 sense 1b) that sets under water and that is made by finely pulverizing the clinker produced by heating a mixture of clay and limestone or similar materials to a high temperature just short of fusing
Drexel engineers have found a way to improve upon ordinary Portland cement …, the glue that's bonded much of the world's construction since the late 1800s.—Swiss National Science Foundation
Once the joints are open, refill them with a dry mix of stone dust and portland cement, mixed at a ratio of 1 part cement to 6 parts dust.—This Old House
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Merriam-Webster unabridged
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