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
• Derivationally related forms: ↑hydrogenate (for: ↑hydrogen)
• Hypernyms: ↑chemical element, ↑element, ↑gas
• Hyponyms: ↑tritium
Useful english dictionary. 2012.