We found one dictionary that defines the word brown hydrogen:

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1. brown hydrogen: Wiktionary

Definitions from Wiktionary (brown hydrogen) ▸ noun:  Hydrogen produced by burning coal. ▸ Words similar to brown hydrogen ▸ Usage examples for brown hydrogen ▸ Idioms related to brown hydrogen ▸ Wikipedia articles (New!) ▸ Words that often appear near brown hydrogen ▸ Rhymes of brown hydrogen ▸ Invented words related to brown hydrogen