Caesium

7 lettersnounrare

Updated June 2026

Definition

An extremely reactive, soft, silver-white metallic element that is liquid near room temperature and is the most electropositive of all metals.

“Caesium atoms are used in atomic clocks because of their exceptionally precise resonance frequency.”

Pronunciation

IPA

/ˈsiːziəm/

Syllables

cae·si·um

Related Words

Synonyms

cesiumcs

Word Game Tips

🟩

Wordle

British spelling uses the AE digraph, contains many vowels A, E, I, U making it vowel-heavy for Wordle.

🔤

Scrabble

Worth 11 points (C3+A1+E1+S1+I1+U1+M3). The M is the key tile, valid British chemical spelling.

Words Related to Caesium

Words you can make from Caesium

Shorter words formed from the letters in “caesium”.

aecium camise cesium miscue acies acmes amice amies amuse cames camis camus cause cusie icasm iseum maces maius mesic mesua micas misce musca musci

Explore Similar Words

7-letter words starting with C 7-letter words ending with M All 7-letter words 6-letter words 8-letter words All word lists

Try These Tools

Anagram Solver Scrabble Helper Crossword Solver Spelling Bee Solver

Dictionary References

Look up caesium in an authoritative dictionary for full definitions, pronunciation, and etymology.

Cambridge Dictionary Merriam-Webster

Download Word Challenge for unlimited word puzzles, a fresh Daily Challenge, and head-to-head multiplayer. Guess the hidden word in six tries or fewer!

Download Free