noun
- A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.
- synonyms: H, atomic number 1
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). hydrogen. Retrieved September 20, 2026, from http://smartdefine.org/hydrogen/definitions/1247646 |
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| MLA | WordNet. "hydrogen" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/hydrogen/definitions/1247646> |