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Cesium is the American spelling of , a soft, silvery metal that is a chemical element (symbol Cs). You meet it in science class and in talk of atomic clocks, which have long used this element because its atoms keep a very steady beat. It is the same substance either way you spell it; only the letters changed for American English. British and international science often keep . It is not a word you need in daily life unless you are reading chemistry.
銫（美式拼法；英式寫 caesium，中文同一個字）
組成American spelling of caesium, the element name. (The element was named from a Latin word for a blue-grey colour, because of a blue line in its light.)
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。