| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024gyp•sum /ˈdʒɪpsəm/USA pronunciation n. [uncountable]- Mineralogya soft white mineral, a form of calcium, used to make plaster of Paris and as a fertilizer.
WordReference Random House Unabridged Dictionary of American English © 2024gyp•sum ( jip′səm),USA pronunciation n. - Mineralogya very common mineral, hydrated calcium sulfate, CaSO4·2H2O, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris, as an ornamental material, as a fertilizer, etc.
- Greek gýpsos chalk, gypsum
- Latin: chalk
- 1640–50
Collins Concise English Dictionary © HarperCollins Publishers:: gypsum /ˈdʒɪpsəm/ n - a colourless or white mineral sometimes tinted by impurities, found in beds as an evaporite. It is used in the manufacture of plaster of Paris, cement, paint, school chalk, glass, and fertilizer. Composition: hydrated calcium sulphate. Formula: CaSO4.2H2O. Crystal structure: monoclinic
Etymology: 17th Century: from Latin, from Greek gupsos chalk, plaster, cement, of Semitic origingypseous /ˈdʒɪpsɪəs/ adj |