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Poisson's ratio

or Poisson ratio

noun, Physics.
the ratio, in an elastic body under longitudinal stress, of the transverse strain to the longitudinal strain.
Origin of Poisson's ratio
First recorded in 1925-30; See origin at Poisson distribution Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Poisson's ratio

Poisson's ratio

a measure of the elastic properties of a material expressed as the ratio of the fractional contraction in breadth to the fractional increase in length when the material is stretched μ, ν
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
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