• WordNet 3.6
    • n gypsum a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
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Webster's Revised Unabridged Dictionary
    • n Gypsum jĭp"sŭm (Min) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
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Century Dictionary and Cyclopedia
    • n gypsum Native hydrous sulphate of calcium, a mineral usually of a white color, but also gray, yellow, red, and when impure brown or black. It is soft and easily scratched; the crystalline varieties, called selenite, are generally perfectly transparent, and cleave readily, yielding thin flexible folia. The crystals are frequently twinned, and often have an arrowhead form. The massive varieties are fibrous (satin-spar), foliated, lamellar-stellate, granular to impalpable. The fine-grained pure white or delicately colored variety is called alabaster, and is used for ornamental purposes; the impure earthy kind, when reduced to the anhydrous form by heat, is called plaster of Paris, and is used extensively for making molds, etc. (See plaster.) Gypsum ground to a powder is used as a fertilizer.
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Chambers's Twentieth Century Dictionary
    • n Gypsum jip′sum a valuable mineral of a comparatively soft kind, burned in kilns, and afterwards ground to a fine powder, called plaster of Paris
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Webster's Revised Unabridged Dictionary
L. gypsum, Gr. gy`psos; cf. Ar. jibs, plaster, mortar, Per. jabsīn, lime
Chambers's Twentieth Century Dictionary
L.,—Gr. gypsos, chalk.


In literature:

Warington has carried out some experiments on the action of gypsum in promoting nitrification.
"Manures and the principles of manuring" by Charles Morton Aikman
Other important products are lignite, gypsum and a variety of valuable stones and clays.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1" by Various
The external indications of the presence of sulphur are the appearance of gypsum and sulphurous springs.
"Scientific American Supplement, No. 647, May 26, 1888" by Various
Gypsum is fairly soluble in ground-water, and sink-holes and solution cavities are often developed in gypsum deposits.
"The Economic Aspect of Geology" by C. K. Leith
The white gypsum in some caves makes the walls look as if they were carved out of snow.
"Earth and Sky Every Child Should Know" by Julia Ellen Rogers
Some iron ore, gypsum, salt and limestone are also produced.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
Plaster and stucco are obtained by exposing gypsum to a strong heat.
"Principles of Geology" by Charles Lyell
The raw material is gypsum (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
In one place there was a bit of what Ace said was needle gypsum, that hung as fine as fur.
"Unexplored!" by Allen Chaffee
At the age of twenty-two, he presented to the Academy of Sciences an analysis of gypsum.
"Blackwood's Edinburgh Magazine, Volume 59, No. 368, June 1846" by Various

In news:

Rigid furring channels (for gypsum products).
A viewing will be held at Everett Family Funeral Home in Gypsum on Thursday from 12:30-8 pm Mass will be held Friday at 11 am at St Mary's Catholic Church in Eagle.
Romney at the National Gypsum Co. Mitt Romney toured a manufacturing plant in Tampa today, fresh off his performance in last night's GOP debate.
Opportunity's discovery of gypsum hailed as best evidence that water once flowed.
TVA to convert Kingston gypsum to dry storage.
Forest Service tree -thinning helps Gypsum biomass plant.
Forest Service tree-thinning helps Gypsum biomass plant.
Revision of C1280 - 12 Standard Specification for Application of Gypsum Sheathing .
Revision of C1280 - 11 Standard Specification for Application of Gypsum Sheathing .
Less than typical gypsum board, depending on the size.
Project benefits wildlife at Gypsum Ponds SWA .
Art and Helen Davenport of Gypsum will celebrate their 65th wedding anniversary with an open house planned in their honor on Saturday, Sept 22, at First Baptist Church in Gypsum.
A boy was born March 27 at Firelands Medical Center to Tiffany and James Mullens, Gypsum.
The company building the biomass plant in Gypsum is preparing to close on a property deal with LaFarge where the plant will be located.
' OURAY – A Blackhawk military helicopter crew from Gypsum Colo.

In science:

Prior to the measurements the gypsum was dried for 48 hours. The transistor was used as a heat source in this measurement setup.
Package Hermeticity Testing with Thermal Transient Measurements
The heat was forced through the gypsum layer into the heat-sink. Thermal transient measurements were made with the T3Ster equipment to measure the thermal resistance of the gypsum at different moisture contents.
Package Hermeticity Testing with Thermal Transient Measurements
By far the best results of the Cyborg Astrobiologist were obtained from lichens and cross-cutting layerings of gypsum or ash (Fig. 10-11). Lichens were detected very accurately as being novel, whether they were in the shadow or in bright sunlight, even after some prior observations of lichens of similar colors.
The Cyborg Astrobiologist: Testing a Novelty-Detection Algorithm on Two Mobile Exploration Systems at Rivas Vaciamadrid in Spain and at the Mars Desert Research Station in Utah
Due to the significant storms in the 3 months between the two missions, there were 2 dark & wet areas in the gypsum cliffs that were visible only during the second mission.
Field Geology with a Wearable Computer: First Results of the Cyborg Astrobiologist System
Due to the significant storms in the 3 months between the two missions, there were 2 dark & wet areas in the gypsum cliffs that were visible only during the second mission.
Field geology with a wearable computer: 1st results of the Cyborg Astrobiologist System