hydrogen

Etymology

From French hydrogène, coined by Louis-Bernard Guyton de Morveau, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”).

Pronunciation

• IPA^(key): /ˈhaɪdɹədʒən/

• Audio (US)

  (file)

• Hyphenation: hy‧dro‧gen

Noun

hydrogen (countable and uncountable, plural hydrogens)

1. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.
   • For quotations of use of this term, see Citations:hydrogen.
2. Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.
3. An atom of the element.
4. A sample of the element.

Noun

hydrogen n (singular definite hydrogenet, not used in plural form)

1. hydrogen

Noun

hydrogen n (definite singular hydrogenet) (uncountable)

1. hydrogen (chemical element, symbol H)

Noun

hydrogen n (definite singular hydrogenet) (uncountable)

1. hydrogen (chemical element, symbol H)