Rubidium

[ʁuˈbiːdi̯ʊm]

/[ʁuˈbiːdi̯ʊm]/ noun

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

The verdict

“Rubidium” is uncommon German (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.

Unranked
below top-frequency German
8
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - chemisches Element mit der Ordnungszahl 37, das zur Gruppe der Alkalimetalle gehört

Key facts for Rubidium
PropertyValue
HeadwordRubidium
LanguageGerman
Part of speechNoun
IPA[ʁuˈbiːdi̯ʊm]
Letters8
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “Rubidium” sits in German frequency

Rubidium falls outside the top-100,000 ranked German words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

Rubidium is uncommon German outside the top frequency list, classed as anoun, transcribed [ʁuˈbiːdi̯ʊm]. Rarity is why readers land here mid-draft. Gloss: "chemisches Element mit der Ordnungszahl 37, das zur Gruppe der Alkalimetalle gehört".

Rubidium doesn't appear in our generated misspelling index, suggesting the orthography follows predictable German patterns. No close-neighbour confusable shows up for this headword in our dataset, since no other headword is close enough in sound or shape to pair with it.

No borrowing history is documented for this entry, so its spelling is best read as a straightforward mapping from sound to letter. The correct German form is Rubidium, spelled R-U-B-I-D-I-U-M.

Definition

  1. 1
    chemisches Element mit der Ordnungszahl 37, das zur Gruppe der Alkalimetalle gehört

This word in other languages

rubidium(English)rubidio(Español)rubidium(Français)rubídio(Português)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "Rubidium"?
"Rubidium" is spelled R-U-B-I-D-I-U-M. The IPA pronunciation is [ʁuˈbiːdi̯ʊm].
What does "Rubidium" mean?
As a noun, "Rubidium" means: chemisches Element mit der Ordnungszahl 37, das zur Gruppe der Alkalimetalle gehört
How do you pronounce "Rubidium"?
The IPA (International Phonetic Alphabet) transcription for "Rubidium" is [ʁuˈbiːdi̯ʊm]. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "Rubidium" come from?
"Rubidium" is a German word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
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 “Rubidium”

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

  • The one correct German spelling is R-U-B-I-D-I-U-M - every other letter order is a misspelling in standard orthography.
  • Say it as [ʁuˈbiːdi̯ʊm] (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
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