nomogram

UK: /ˈnɒməˌɡræm/ US: (nom′ə gram′, nō′mə-)

WordReference Random House Unabridged Dictionary of American English © 2026

nom•o•gram  (nom′ə gram′, nō′mə-), n. 

1. Mathematics 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.

any similar graph used to show the relation between quantities, values, numbers, and so on. Also called nom•o•graph  (nom′ə graf′, -gräf′, nō′mə-), alignment chart. 

• nomo- + -gram¹ 1905–10

Collins Concise English Dictionary © HarperCollins Publishers::

nomogram / ˈnɒməˌɡræm ˈnəʊmə-/, nomograph noun

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

Etymology: 20th Century: from Greek nomos law + -gram, on the model of French nomogramme