hydrogen
noun
hy·dro·gen
ˈhī-drə-jən 
-dər-
: a nonmetallic gaseous chemical element with atomic number 1 that is the simplest and lightest of the elements and that is used especially in the processing of fossil fuels and the synthesis of ammonia
—often used before another noun
hydrogen gas
hydrogen atoms
a hydrogen vehicle
the hydrogen industry
see Chemical Elements Table compare deuterium, tritium
Examples of hydrogen in a Sentence
Recent Examples on the Web
The company said major equipment including wind turbines, electrolysers and hydrogen storage vessels are currently being installed.
—
Amira El-Fekki, MSNBC Newsweek, 4 June 2025
Temperatures inside the engine would reach nearly 5,000° Fahrenheit, boiling the hydrogen and driving the resulting gas through a nozzle, generating thrust.
—Stephen Clark – Jun 3, ArsTechnica, 3 June 2025
Its core of hydrogen fusion will expand and, in doing so, inflate the outer atmosphere of the star into gross proportions.
—Paul Sutter, Space.com, 3 June 2025
Muñoz's perspective on hydrogen extends beyond individual vehicles to encompass an entire ecosystem.
—Sarwant Singh, Forbes.com, 3 June 2025
See All Example Sentences for hydrogen
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Amira El-Fekki, MSNBC Newsweek, 4 June 2025
Temperatures inside the engine would reach nearly 5,000° Fahrenheit, boiling the hydrogen and driving the resulting gas through a nozzle, generating thrust.
—Stephen Clark – Jun 3, ArsTechnica, 3 June 2025
Its core of hydrogen fusion will expand and, in doing so, inflate the outer atmosphere of the star into gross proportions.
—Paul Sutter, Space.com, 3 June 2025
Muñoz's perspective on hydrogen extends beyond individual vehicles to encompass an entire ecosystem.
—Sarwant Singh, Forbes.com, 3 June 2025
See All Example Sentences for hydrogen
Cite this Entry
“Hydrogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen. Accessed 9 Jun. 2025.
Copy CitationKids Definition
hydrogen
noun
hy·dro·gen
ˈhī-drə-jən
: a chemical element that is the simplest and lightest of all chemical elements and is normally found alone as a colorless odorless highly flammable gas having two atoms per molecule see element
Etymology
from French hydrogène "hydrogen," from hydr- "water" and -gène "producer"; so called because when hydrogen gas burns, it combines with oxygen to produce water
Medical Definition
hydrogen
noun
hy·dro·gen
ˈhī-drə-jən
: a nonmetallic element that is the simplest and lightest of the elements and that is normally a colorless odorless highly flammable diatomic gas
—symbol H
see deuterium, tritium Chemical Elements Table
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