Definition of caesium
- chiefly British spelling of cesium
Britannica.com: Encyclopedia article about caesium
What made you want to look up caesium? Please tell us where you read or heard it (including the quote, if possible).
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
Can you spell these 10 commonly misspelled words?TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.TAKE THE QUIZ