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 system, known as electrolysis, produces hydrogen (H2) and CO2 that can be stored and used as feedstocks for sustainable aviation fuels (SAF) and e-methanol for shipping.
—
Nino Paoli, Fortune, 19 Sep. 2025
Tackling hydrogen storage challenges Hydrogen has long been championed as a clean energy carrier, but storing it has proven difficult.
—Atharva Gosavi, Interesting Engineering, 19 Sep. 2025
These contain no carbon atoms, like ammonia and hydrogen.
—Michaila Byrne, MSNBC Newsweek, 18 Sep. 2025
Given the growth possibilities within the hydrogen economy, this may be deemed reasonable – assuming the company can execute well.
—Trefis Team, Forbes.com, 18 Sep. 2025
See All Example Sentences for hydrogen
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Nino Paoli, Fortune, 19 Sep. 2025
Tackling hydrogen storage challenges Hydrogen has long been championed as a clean energy carrier, but storing it has proven difficult.
—Atharva Gosavi, Interesting Engineering, 19 Sep. 2025
These contain no carbon atoms, like ammonia and hydrogen.
—Michaila Byrne, MSNBC Newsweek, 18 Sep. 2025
Given the growth possibilities within the hydrogen economy, this may be deemed reasonable – assuming the company can execute well.
—Trefis Team, Forbes.com, 18 Sep. 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 22 Sep. 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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