| conodont | (noun) small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes | - |
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| (noun) the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta | - |
| conoid | (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone, cone shape |
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| econometrician | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrist |
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| econometrics | (noun) the application of mathematics and statistics to the study of economic and financial data | - |
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| econometrist | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrician |
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| economics | (noun) the branch of social science that deals with the production and distribution and consumption of goods and services and their management | Synonyms: economic science, political economy |
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| economiser | (noun) a frugal person who limits spending and avoids waste | Synonyms: economizer |
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| economist | (noun) an expert in the science of economics | Synonyms: economic expert |
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| economizer | (noun) a frugal person who limits spending and avoids waste | Synonyms: economiser |
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| economy | (noun) an act of economizing; reduction in cost | Synonyms: saving |
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| (noun) frugality in the expenditure of money or resources | Synonyms: thriftiness |
| (noun) the efficient use of resources | - |
| (noun) the system of production and distribution and consumption | Synonyms: economic system |
| iconoclasm | (noun) the orientation of an iconoclast | - |
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| iconoclast | (noun) someone who attacks cherished ideas or traditional institutions | - |
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| (noun) a destroyer of images used in religious worship | Synonyms: image breaker |
| iconography | (noun) the images and symbolic representations that are traditionally associated with a person or a subject | - |
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| iconolatry | (noun) the worship of sacred images | - |
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| iconology | (noun) the branch of art history that studies visual images and their symbolic meaning (especially in social or political terms) | - |
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| iconoscope | (noun) the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin | - |
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| macroeconomics | (noun) the branch of economics that studies the overall working of a national economy | - |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| microeconomics | (noun) the branch of economics that studies the economy of consumers or households or individual firms | - |
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| microeconomist | (noun) an economist who specializes in microeconomics | Synonyms: microeconomic expert |
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