# Legionnaires' disease

> English word · Noun

## Definitions
1. a form of severe pneumonia caused by legionella (bacteria of the genus Legionella).

## Etymology
From Legionnaires, members of the American Legion, who were the first described victims of the disease.

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