| calcaneus | (noun) the largest tarsal bone; forms the human heel | Synonyms: heelbone, os tarsi fibulare |
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| calcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: chalcedony |
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| calceolaria | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: slipperwort |
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| calceus | (noun) a shoe covering the ankle; worn by ancient Romans | - |
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| calciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: cholecalciferol, D, ergocalciferol, viosterol, vitamin D |
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| calcification | (noun) a process that impregnates something with calcium (or calcium salts) | - |
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| (noun) tissue hardened by deposition of lime salts | - |
| (noun) an inflexible and unchanging state | - |
| calcimine | (noun) a water-base paint containing zinc oxide and glue and coloring; used as a wash for walls and ceilings | - |
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| calcination | (noun) the conversion of metals into their oxides as a result of heating to a high temperature | - |
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| calcite | (noun) a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone | - |
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| calcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: thyrocalcitonin |
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| calcium | (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals | Synonyms: atomic number 20, Ca |
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| calculability | (noun) The quality of being subject to or ascertainable by calculation. | - |
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| calculation | (noun) the procedure of calculating; determining something by mathematical or logical methods | Synonyms: computation, computing |
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| (noun) problem solving that involves numbers or quantities | Synonyms: computation, figuring, reckoning |
| (noun) planning something carefully and intentionally | Synonyms: deliberation |
| calculator | (noun) a small machine that is used for mathematical calculations; can be mechanical or electronic | Synonyms: calculating machine |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: computer, estimator, figurer, reckoner |
| calculus | (noun) the branch of mathematics that is concerned with limits and with the differentiation and integration of functions | Synonyms: infinitesimal calculus |
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| (noun) a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body | Synonyms: concretion |
| (noun) an incrustation that forms on the teeth and gums | Synonyms: tartar, tophus |