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nomogram

[nom-uh-gram, noh-muh-]
noun
  1. a graph, usually containing three parallel scales graduated for different variables so that when a straight line connects values of any two, the related value may be read directly from the third at the point intersected by the line.
  2. any similar graph used to show the relation between quantities, values, numbers, and so on.
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Origin of nomogram

First recorded in 1905–10; nomo- + -gram1
Also called nom·o·graph [nom-uh-graf, -grahf, noh-muh-] /ˈnɒm əˌgræf, -ˌgrɑf, ˈnoʊ mə-/, alignment chart.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for nomogram

nomogram

nomograph

noun
  1. an arrangement of two linear or logarithmic scales such that an intersecting straight line enables an intermediate values or values on a third scale to be read off
  2. any graphic representation of numerical relationships
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Word Origin

C20: from Greek nomos law + -gram, on the model of French nomogramme
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012