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1
: a widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris
2
: drywall
Examples of gypsum in a Sentence
Recent Examples on the Web
On the mosaic’s surface, experts discovered natural wax and gypsum, which were probably left over from previous conservation efforts.
—Sonja Anderson, Smithsonian Magazine, 22 Jan. 2025
Experts place the coffin between 43 A.D. and 410 A.D. but have not determined the exact year it was made, nor the reason gypsum was inside the coffin.
—Andrea Margolis, Fox News, 16 Jan. 2025
These marble-sized balls are then crushed and mixed with additives like gypsum to create the cement.
—Lara Williams, The Mercury News, 5 Nov. 2024
During the Cold War, Stalin, facing a champagne ban, ordered the establishment of a high-end facility there, in a former gypsum mine more than two hundred feet underground.
—Boris Fishman, The New Yorker, 25 Nov. 2024
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Word History
Etymology
Latin, from Greek gypsos
First Known Use
14th century, in the meaning defined at sense 1
Time Traveler
The first known use of gypsum was
in the 14th century
Dictionary Entries Near gypsum
Cite this Entry
“Gypsum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gypsum. Accessed 27 Jan. 2025.
Kids Definition
gypsum
noun
gyp·sum
ˈjip-səm
: a colorless mineral that consists of calcium sulfate occurring in crystals or masses and that is used especially as a soil improver and in making plaster of paris
Medical Definition
gypsum
noun
gyp·sum
ˈjip-səm
: a widely distributed mineral CaSO4·2H2O consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris
More from Merriam-Webster on gypsum
Nglish: Translation of gypsum for Spanish Speakers
Britannica English: Translation of gypsum for Arabic Speakers
Britannica.com: Encyclopedia article about gypsum
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