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Poisson's ratio

or Poisson ratio

noun

, Physics.
  1. the ratio, in an elastic body under longitudinal stress, of the transverse strain to the longitudinal strain.

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 stretched μν

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Word History and Origins

Origin of Poisson's ratio1

First recorded in 1925–30; Poisson distribution

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