A book — or now more often a website or a button in your word processor — that groups words by meaning. You look up a word you already know, and it shows you other words that mean something close: for 'happy' it might give glad, pleased, cheerful, delighted, content.

A book一本書 or now more often a website or a button in your word processor或者現在更常是一個網站，或文書處理軟體裡的一個按鈕 that groups words by meaning把意思相近的字歸類在一起 You look up a word you already know你查一個自己已經會的字 and it shows you other words that mean something close它就會給你其他意思相近的字 for 'happy' it might give glad, pleased, cheerful, delighted, content像查'happy'，可能會給你glad、pleased、cheerful、delighted、content

Writers use one when a word feels too plain, or when they have used the same word three times in one paragraph. Note the difference from a dictionary: a dictionary tells you what a word means, a thesaurus tells you what else you could say instead.

Writers use one作者會用它 when a word feels too plain當一個字感覺太平淡的時候 or when they have used the same word three times in one paragraph或是同一個字在同一段裡已經用了三次的時候 Note the difference from a dictionary注意它跟字典不一樣 a dictionary tells you what a word means字典告訴你一個字是什麼意思 a thesaurus tells you what else you could say insteadthesaurus告訴你還可以換說什麼字

The plural is unusual — careful writers say 'thesauri', but 'thesauruses' is common and fine. The most famous one is Roget's Thesaurus, and older speakers may simply say 'look it up in Roget's'.

The plural is unusual它的複數形式比較特別 careful writers say 'thesauri'講究的作者會說'thesauri' but 'thesauruses' is common and fine但'thesauruses'也很常見，沒問題 The most famous one is Roget's Thesaurus最有名的一本是Roget's Thesaurus and older speakers may simply say 'look it up in Roget's'年紀比較大的人可能會直接說「去Roget's裡查」