hydrogen

Fetched 2026-10-26 (cache).

Synonyms: hydrogel, hydron, androgen, pyrogen, hydromel, dihydrogen, hydrogels, hyalogen, hydrogens, hydrolea, hydrojet

Antonyms: hydrogel, hydron, androgen, pyrogen, hydromel, dihydrogen, hydrogels, hyalogen, hydrogens, hydrolea, hydrojet

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{senseid|en|Q556}}{{lb|en|uncountable|chemistry}} The [[light#Adjective|lightest]] [[chemical element]] ([[symbol#Noun|symbol]] [[H#Translingual: Q556|H]]), with an [[atomic number]] of 1 and [[atomic weight]] of 1.008.
2. {{senseid|en|Q3027893}}{{lb|en|uncountable}} [[molecular#Adjective|Molecular]] hydrogen (''{{senseno|en|Q556}}''; symbol H{{sub|2}}), a [[colourless]], [[odourless]] and [[flammable#Adjective|flammable]] [[gas#Noun|gas]] at [[room temperature]].
3. {{senseid|en|Q12830437}}{{lb|en|uncountable}} {{synonym of|en|protium|t=the lightest and most [[common#Adjective|common]] [[isotope]] of hydrogen ({{italic|{{senseno|en|Q556}}}}; symbol H, {{sup|1}}H, or {{nuclide|1|1|H}}), as [[contrast#Verb|contrasted]] with [[deuterium]] and [[tritium]]}}.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.