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Hydrogen

//ˈhaɪdɹəd͡ʒən// noun

Definitions

Noun

1
The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008. countable, uncountable
"Our professor then reminded us that a hydrogen ion is merely a proton, and thus we should think about acid-base theory as we consider this problem further."
2
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 wordnet
3
The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.; An atom of this element. countable, uncountable
"Each carbon of the ring has one hydrogen attached except for the fourth one, which is bonded to a substituent."
4
Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature. countable, uncountable
"A large tank of hydrogen constituted most of the bulk of that rocket."
5
Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.; A molecule of this molecular species. countable, uncountable

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6
The isotope hydrogen-1 (protium) (symbol H or ¹H), contrasting with deuterium and tritium. countable, uncountable
"Both hydrogen and deuterium are present in every glass of water that you drink, but the amount of deuterium is rather small."
7
A sample of the element or molecule. countable, uncountable

Etymology

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

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