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
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This includes battery-electric and hydrogen fuel cell electric vehicles
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The Honda 0 SUV is scheduled to go on sale in early 2026 before heading to global markets.
—
Newsweek, 7 Jan. 2025
These moves come after the U.S. Department of the Treasury released final rules for billions in tax credits for companies involved in making hydrogen in an effort to grow the clean energy industry.
—Sean Conlon, CNBC, 6 Jan. 2025
That’s because whether hydrogen can be considered a clean fuel depends on how it’s made.
—Justine Calma, The Verge, 6 Jan. 2025
The 804-foot-long vessel was filled with highly flammable hydrogen, and 36 passengers were killed in the explosion.
—Sarah Kuta, Smithsonian Magazine, 6 Jan. 2025
See all Example Sentences for hydrogen 
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Newsweek, 7 Jan. 2025
These moves come after the U.S. Department of the Treasury released final rules for billions in tax credits for companies involved in making hydrogen in an effort to grow the clean energy industry.
—Sean Conlon, CNBC, 6 Jan. 2025
That’s because whether hydrogen can be considered a clean fuel depends on how it’s made.
—Justine Calma, The Verge, 6 Jan. 2025
The 804-foot-long vessel was filled with highly flammable hydrogen, and 36 passengers were killed in the explosion.
—Sarah Kuta, Smithsonian Magazine, 6 Jan. 2025
See all Example Sentences for hydrogen
Dictionary Entries Near hydrogen
Cite this Entry
“Hydrogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen. Accessed 21 Jan. 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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