# d'Alembert's paradox

> English word · Proper noun

## Definitions
1. The contradiction that, for incompressible and inviscid potential flow, the drag force is zero on a body moving with constant velocity relative to the fluid.

## Etymology
Observed in 1752 by French mathematician Jean le Rond d'Alembert.

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