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

Examples of Portland cement in a Sentence

Recent Examples on the Web
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The result is a white powder that can be used as a blend with traditional Portland cement or sold as a stand-alone product to other cement producers. Jim Vinoski, Forbes, 23 Nov. 2024 When the cement industry began to boom in the early 20th century, people discovered the limestone around Union Bridge had the right chemical composition to produce Portland cement. Mary Ann Ashcraft, Baltimore Sun, 23 Nov. 2024

Word History

Etymology

Isle of Portland, England; from its resemblance to a limestone found there

First Known Use

1824, in the meaning defined above

Time Traveler
The first known use of Portland cement was in 1824

Dictionary Entries Near Portland cement

Cite this Entry

“Portland cement.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Portland%20cement. Accessed 3 Jan. 2025.

Kids Definition

portland cement

noun
: a cement made of clay and limestone
Last Updated: - Updated example sentences
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