hydrogen

noun

The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.

Molecular hydrogen (H₂), a colourless, odourless and flammable gas at room temperature.

An atom of the element.

The isotope hydrogen-1 (protium) (symbol H or ¹H), contrasting with deuterium and tritium

A molecule of this molecular species

A sample of the element/molecule.

Roots

hydorhydro- · Greek · water gignomai-gen · Greek · produce, beget

Synonyms & related words for hydrogen

Find synonyms, related words, and the definition of hydrogen. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to hydrogen

Explore words related to hydrogen — words associated with it, words that go with it, and its nearest matches in meaning. Related words include hydrogenous, orthohydrogen, hydrogenize, oxygen, parahydrogen, scolecite, wavellite, protoxide. Click any word to make it the center of the map and keep exploring the web of connections.

Where does hydrogen come from?

The word hydrogen breaks down into 2 roots of Greek origin: hydro-, from Greek hydor (“water”); and -gen, from Greek gignomai (“produce, beget”). Explore each root to see other English words built from the same source.