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Poisson's ratio

noun, Physics.
the ratio, in an elastic body under longitudinal stress, of the transverse strain to the longitudinal strain.
Also, Poisson ratio.
1925-30; see Poisson distribution
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for poissons 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
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