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gypsum
| Babylon English | Download this dictionary |
gypsum
n.
colorless mineral from which plaster of Paris is made
| English Wikipedia - The Free Encyclopedia | Download this dictionary |
Gypsum
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer, and as the main constituent in many forms of plaster, blackboard chalk and wallboard. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, Byzantine empire and the Nottingham alabasters of medieval England. It is the definition of a hardness of 2 on the Mohs scale of mineral hardness. It forms as an evaporite mineral and as a hydration product of anhydrite.
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| WordNet 2.0 | Download this dictionary |
gypsum
Noun
1. a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
(hypernym) mineral
(hyponym) alabaster
(substance-holonym) plaster of Paris, plaster
(substance-meronym) calcium, Ca, atomic number 20
| Babylon English-Czech | Download this dictionary |
gypsum
n.
sádrovec; sádra
| Webster's Revised Unabridged Dictionary (1913) | Download this dictionary |
Gypsum
(n.)
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.
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.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
