Poisson's ratio

or Poisson ratio

noun Physics.
  1. 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
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British Dictionary definitions for poisson's ratio

Poisson's ratio

noun
  1. 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 stretchedSymbol: 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