"词典" 的英文是 "dictionary"。

来源：
"Dictionary" 来源于拉丁语 "dictionarius"，表示 "of or for words"。

例句：

I need to look up this word in the dictionary.
我需要在词典里查这个单词。

Can you pass me the Engpsh-Chinese dictionary?
你能把英汉词典给我吗？

He always carries a pocket dictionary with him.
他总是带着一本口袋词典。

She has a vast knowledge of words, you can always ask her for the definition of any word you don't know.
她对词语有着广博的了解，你可以随时问她任何不知道的词语的定义。