Cäsium

[ˈt͡sɛːzi̯ʊm]

/[ˈt͡sɛːzi̯ʊm]/ noun

By · According to Wiktionary data (CC BY-SA) ·

The verdict

“Cäsium” is uncommon German (frequency #96,818 among 20,081 “C” headwords), classed as a noun. The kind of spelling people second-guess.

#96,818
frequency rank, German
20,081
“C” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - chemisches Element mit der Ordnungszahl 55, das zur Gruppe der Alkalimetalle gehört

Key facts for Cäsium
PropertyValue
HeadwordCäsium
LanguageGerman
Part of speechNoun
IPA[ˈt͡sɛːzi̯ʊm]
Letters6
Frequency rank#96,818
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “Cäsium” sits in German frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). Cäsium lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

Cäsium is uncommon German at frequency #96,818 among 20,081 “C” headwords, classed as anoun, transcribed [ˈt͡sɛːzi̯ʊm]. Rarity is why readers land here mid-draft. Gloss: "chemisches Element mit der Ordnungszahl 55, das zur Gruppe der Alkalimetalle gehört".

Our edit-distance generator produced no likely misspellings for Cäsium, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, a sign it's visually distinctive enough not to be mixed up with another word.

This entry's etymology isn't recorded, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct German form is Cäsium, spelled C-Ä-S-I-U-M.

Definition

  1. 1
    chemisches Element mit der Ordnungszahl 55, das zur Gruppe der Alkalimetalle gehört

This word in other languages

caesium(English)cesio(Español)cæsium(Français)césio(Português)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 German corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "Cäsium"?
"Cäsium" is spelled C-Ä-S-I-U-M. The IPA pronunciation is [ˈt͡sɛːzi̯ʊm].
What does "Cäsium" mean?
As a noun, "Cäsium" means: chemisches Element mit der Ordnungszahl 55, das zur Gruppe der Alkalimetalle gehört
How do you pronounce "Cäsium"?
The IPA (International Phonetic Alphabet) transcription for "Cäsium" is [ˈt͡sɛːzi̯ʊm]. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "Cäsium" come from?
"Cäsium" is a German word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “Cäsium”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct German spelling is C-Ä-S-I-U-M - every other letter order is a misspelling in standard orthography.
  • Say it as [ˈt͡sɛːzi̯ʊm] (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Browse more German words and confusable pairs in the same reference. German words

Other uncommon German words near this rank

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list