# metallic hydrogen

> English word · Noun

## Definitions
1. a degenerate matter phase of hydrogen that is electrically conductive; formed under extreme pressure

## Etymology
From metallic + hydrogen. From hydrogen being like a metal, having free-roaming electrons that support electrical conductivity.

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