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groma

[groh-muh] /ˈgroʊ mə/
noun, (in ancient Roman surveying)
1.
an instrument having a cruciform wooden frame with a plumb line at the end of each arm, used for laying out lines at right angles to existing lines.
Origin
< Latin grōma, grūma, by dissimilation < Greek gnôma, presumably with sense of gnṓmōn carpenter's square; see gnomon
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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