A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). portland cement. Retrieved September 30, 2026, from http://smartdefine.org/portland_cement/definitions/2047687 |
| Chicago | Webster's. 2011. "portland cement" http://smartdefine.org/portland_cement/definitions/2047687 (accessed September 30, 2026). |
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| MLA | Webster's. "portland cement" 27 May 2011. Web. 30 September 2026. <http://smartdefine.org/portland_cement/definitions/2047687> |