# Casimir force

> English word · Noun

## Definitions
1. A physical force of attraction between very closely separated objects, due to random quantum fluctuations of the electromagnetic field in a vacuum; it is inversely proportional to the fourth power of the distance of separation

## Etymology
After Hendrik Casimir, Dutch physicist.

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