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Definition of hydrogen

hydrogen

/ˈhaɪ.drə.dʒən/
hy · dro · gen
Plural:hydrogens
•
Adjective:hydrogenous
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hydrogen Lexical Profile

hydrogen Game Scores & Validity

• noun

1

A colorless, odorless, highly flammable gaseous chemical element with atomic number 1 and symbol H, which is the lightest and most abundant element in the universe and combines with oxygen to form water.

Example

"Scientists are developing clean energy vehicles powered by hydrogen fuel cells that emit only water vapor."

2

A single atom or ion of the element hydrogen within a molecule or chemical reaction.

Example

"Each molecule of methane contains one central carbon atom bonded to four hydrogens."

• Rhymes for hydrogen

• Nearby Words

hydroelectric
hydroelectricity
hydrofoil
hydrogen
hydromassage
hydrometer
hydrophobia

Word Origin & Etymology

Coined in French as 'hydrogène' in 1787 by chemist Antoine Lavoisier and his colleagues from Ancient Greek 'hydōr' (water) and 'gennan' (to generate), because burning the gas in oxygen produces water.

Cite this Entry

Wordmom. (2026). Definition of Hydrogen. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/hydrogen
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