noun · 2 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
US:ūrā'nēəm
US:/ˌjuːˈɹeɪniəm/
UK:/jʊˈɹeɪniəm/
UK:/ˌjyːˈɹəɪ̯nɪ̝əm/
UK:/jʏˈɹəɪ̯nɪ̝əm/
US:Recorded audio is listed in the source snapshot.
General-American:Recorded audio is listed in the source snapshot.
rhymes with -eɪniəm
CMU ARPABET:Y ER0 EY1 N IY0 AH0 M
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The element with atomic number 92 and symbol U. A radioactive silvery-grey metal in the actinide series.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: U, atomic number 92
Antonyms: none provided
Broader terms: metallic element, metal
Narrower terms: uranium 235, uranium 238
History
Etymology
Etymology tree Ancient Greek οὐρᾰνός (ourănós) Ancient Greek Οὐρᾰνός (Ourănós)der. Latin Ūranusbor. English Uranus Proto-Indo-European *-om Proto-Italic *-om Latin -umder. English -ium English uranium After Uranus (the planet), + -ium.
Across languages
Translations
98 source translations are retained for this English entry.