# Hamman's sign

> English word · Proper noun

## Definitions
1. A crunching, rasping sound, synchronous with the heartbeat, heard over the precordium in spontaneous mediastinal emphysema produced by the heart beating against air-filled tissues.

## Etymology
Named after Johns Hopkins clinician Louis Hamman.

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