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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.
Poisson's ratio
noun
- 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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