Dictionary.com
Thesaurus.com

brown hydrogen

American  
[broun hahy-druh-juhn] / ˈbraʊn ˈhaɪ drə dʒən /

noun

  1. hydrogen that is produced by breaking down coal, especially lignite, with steam and oxygen, releasing high amounts of carbon into the atmosphere.

Etymology

Origin of brown hydrogen

First recorded in 2005–10

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.