hydrogen
Definition
- n. 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
Word forms
- Plural
- hydrogens
Example sentences
n.
Hydrogen is the lightest element in the periodic table.
化
H-2, also known as deuterium, is used in nuclear fusion reactions.