HYDROGEN

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does hydrogen mean? 

• HYDROGEN (noun)
  The noun HYDROGEN has 1 sense:

1. 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

  Familiarity information: HYDROGEN used as a noun is very rare.

 Dictionary entry details 

• HYDROGEN (noun)

Sense 1

Meaning:

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

Classified under:

Nouns denoting substances

Synonyms:

atomic number 1; H; hydrogen

Hypernyms ("hydrogen" is a kind of...):

chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

gas (a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely)

Hyponyms (each of the following is a kind of "hydrogen"):

tritium (a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms)

Holonyms ("hydrogen" is a substance of...):

H2O; water (binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent)

Derivation:

hydrogenate (combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound))

 Context examples 

This term does not apply to the disruption of hydrogen bonds that stabilize DNA and RNA molecules.

(Nucleic Acid Cleavage, NCI Thesaurus)

A chemical that gives off hydrogen ions in water and forms salts by combining with certain metals.

(Acid, NCI Dictionary)

The process frequently ocurrs in cells when superoxide radical and hydrogen peroxide species are released.

(Oxidative Burst, NCI Thesaurus)

The substrate that is oxidized is regarded as a hydrogen donor.

(Oxidoreductase, NCI Thesaurus)

Stars like our Sun burn hydrogen in their cores for most of their lives.

(First Giant Planet around White Dwarf Found, ESO)

Researchers used the GRaND instrument to determine the concentrations of hydrogen, iron and potassium in the uppermost yard (or meter) of Ceres.

(Where is the Ice on Ceres?, NASA)

Like the giant planets in our solar system, their atmospheres are rich in hydrogen, but they orbit different types of stars.

(Water common – yet scarce – in exoplanets, University of Cambridge)

Many of these carcinogenic chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements.

(Organic Carcinogen, NCI Thesaurus)

This species is motile, spore forming, catalase positive, urease positive, indole negative, produces hydrogen sulfide, reduces nitrate, and hydrolyzes starch and esculin but not casein or gelatin.

(Bacillus lentus, NCI Thesaurus)

The Australian team describes the membrane technology that separates hydrogen from other gases as a “watershed moment for energy.”

(Cars Powered by New Fuel Type Tested in Australia, VOA)