hydrogen | ||
1. | [ noun ] (chemistry) 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: | atomic_number_1 H | |
Related terms: | gas chemical_element tritium water | |
Similar spelling: |
hydrogenate hydrogel hydrozoan hydroxide hydrocele hydroxy hydrous hydrography Hydrozoa hydroxyzine hydroxyl |