# Poisson effect

> English word · Noun

## Definitions
1. The tendency of a material to deform in the directions perpendicular to that of an applied force. The effect is quantified by a material's Poisson's ratio.

## Etymology
Named after French mathematician, mechanician and physicist Siméon Denis Poisson.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/poisson-effect