# dark hydrogen

> English word · Noun

## Definitions
1. A state of hydrogen that is poorly electrically conductive (much less conductive than metallic hydrogen).

## Etymology
From being a state of matter which neither transmits nor reflects visible light, but can transmit infrared.

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