What does "hydrogen" mean?
The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
Hydrogen
/ˈhaɪdɹəd͡ʒən/ noun
noun ·Moderate ·College level
Meaning at a glance
- Primary sense: The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
- Grammar: hydrogen is listed as noun.
- Nearest alternatives: ammonia, atomic number 1, carbon dioxide, chemical element.
- Useful contrasts: atomic hydrogen, metal, monatomic gas.
- Usage evidence: This substance is mostly composed of hydrogen and oxygen.
How to use "hydrogen"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "hydrogen" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "hydrogen" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "hydrogen" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "hydrogen" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "hydrogen" is acting as noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "ammonia" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "hydrogen", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
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
Show 2 more definitions
- 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
Synonyms
All synonymsExample
"This substance is mostly composed of hydrogen and oxygen."
Common questions
What is a synonym for "hydrogen"?
Common synonyms include: ammonia, atomic number 1, carbon dioxide, chemical element, dihydrogen, e949.
How do you use "hydrogen" in a sentence?
This substance is mostly composed of hydrogen and oxygen.
How do you pronounce "hydrogen"?
Pronounced /ˈhaɪdɹəd͡ʒən/.
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.