Multiple choice general knowledge science & technology What is the definition of poisons ratio. ration of lateral strain to longitudinal strain ration of logitudinal strain to lateral strain product of lateral and longitudinal strain sq root of ration of lateral strain to longitudinal strain Reveal answer Fill a bubble to check yourself A Correct answer Explanation Poisson's ratio is defined as the negative ratio of lateral (transverse) strain to longitudinal (axial) strain under uniaxial loading.