Hydrogen
WordNet
noun
(1) 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
WiktionaryText
Etymology
From hydrogène, coined by Louis-Bernard Guyton de Morveau, from + .
Noun
- The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794.
- Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature.
- An atom of the element.
- A sample of the element.
Related terms
- hydrion
- hydrogenase
- hydrogenite
- hydronium