Quadrat definitions

kwŏd'rət, -răt'
A piece of type metal lower than the raised typeface, used for filling spaces and blank lines.
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Any of a group of small, usually rectangular plots of land used for sampling the occurrence of species or of archaeological artifacts.
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A sampling plot, usually one square meter, used to study and analyze plant or animal life.
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Any of a group of small, usually rectangular plots of land used for sampling the occurrence of species or of archaeological artifacts.
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(sciences) An area of land, marked for studying its plants, animals, soil, natural processes, etc. While originally rectangular, modern quadrats can be rectangular, circular, irregular, etc. (e.g.: Krebs, C.J., 1999. Ecological Methodology. Addison-Welsey Educational Publishing, Inc., Menlo Park, California; Wheater, C.P., Bell, J.R., Cook, P.A., 2011. Practical Field Ecology: A Project Guide. John Wiley and Sons, Chichester, West Sussex, England.)
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(letterpress typography, obsolete) A quad; a blank metal block used to fill space in lines of type.
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Origin of quadrat

1683. Probably from French cadrat or Italian quadrato (“square”), originally from Latin quadrātum (“square”). So called because the basic quadrat, the em quadrat, has a square face, having the same width as the height of a line of type.