Meanings
nouncaesium (uncountable)
alternative dated cæsium · alternative US cesium
- uncountableThe chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Synonyms & antonyms
nouna soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
Broader
metallic elementmetal
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Latincaesius“sky-blue”
- Englishcaesium
From Latin caesius (“sky-blue”), in reference to the radiation spectra, + -ium.
More words from Latin
Full word history & related roots →Translations
Afrikaans sesium
- sesiuma metallic chemical element
Arabic سِيزِيُوم
- سِيزِيُوم (sīziyūm)a metallic chemical element
Basque zesioa
- zesioaa metallic chemical element
Bulgarian це́зий
- це́зий (cézij)a metallic chemical element
Catalan cesi
- cesia metallic chemical element
Chinese Mandarin 銫 /铯
- 銫 /铯 (sè)a metallic chemical element
Czech cezium, cesium
- ceziuma metallic chemical element
- cesiuma metallic chemical element
Danish cæsium
- cæsiuma metallic chemical element
Dutch cesium
- cesiuma metallic chemical element
Esperanto cezio
- cezioa metallic chemical element
Estonian tseesium
- tseesiuma metallic chemical element
Finnish cesium
- cesiuma metallic chemical element
French césium, cæsium
- césiuma metallic chemical element
- cæsiuma metallic chemical element
German Cäsium, Zäsium
- Cäsiuma metallic chemical element
- Zäsiuma metallic chemical element
Greek καίσιο
- καίσιο (kaísio)a metallic chemical element
Hebrew צסיום, צזיום
- צסיום (tsesyum)a metallic chemical element
- צזיום (tsezyum)a metallic chemical element
Hindi द्युतातु
- द्युतातु (dyutātu)a metallic chemical element
Hungarian cézium
- céziuma metallic chemical element
Icelandic sesín
- sesína metallic chemical element
Indonesian sesium
- sesiuma metallic chemical element
Irish caeisiam
- caeisiama metallic chemical element
Italian cesio
- cesioa metallic chemical element
Japanese セシウム
- セシウム (seshiumu)a metallic chemical element
Korean 세슘
- 세슘 (sesyum)a metallic chemical element
Latin caesium
- caesiuma metallic chemical element
Latvian cēzijs
- cēzijsa metallic chemical element
Lithuanian cezis
- cezisa metallic chemical element
Malay sesium
- sesiuma metallic chemical element
Norwegian Bokmål cesium
- cesiuma metallic chemical element
Persian سزیم
- سزیم (seziyom)a metallic chemical element
Polish cez
- ceza metallic chemical element
Portuguese césio
- césioa metallic chemical element
Punjabi ਸੀਜ਼ੀਅਮ
- ਸੀਜ਼ੀਅਮ (sīzīama)a metallic chemical element
Romanian cesiu
- cesiua metallic chemical element
Russian це́зий
- це́зий (cézij)a metallic chemical element
Scottish Gaelic caesium
- caesiuma metallic chemical element
Slovak cézium
- céziuma metallic chemical element
Spanish cesio
- cesioa metallic chemical element
Swedish cesium
- cesiuma metallic chemical element
Tagalog sesyo
- sesyoa metallic chemical element
Tamil சீரிலியம்
- சீரிலியம் (cīriliyam)a metallic chemical element
Thai ซีเซียม
- ซีเซียม (sii-sîiam)a metallic chemical element
Turkish sezyum
- sezyuma metallic chemical element
Ukrainian це́зій
- це́зій (cézij)a metallic chemical element
Vietnamese xezi, xêzi
- xezia metallic chemical element
- xêzia metallic chemical element
Welsh cesiwm
- cesiwma metallic chemical element
Cite this entry
APA
caesium. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/caesium
MLA
“caesium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/caesium. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “caesium,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/caesium.
Source: caesium on Wiktionary, CC BY-SA 4.0.