**The Longest English Word**

According to the Oxford English Dictionary, the longest English word is **pneumonoultramicroscopicsilicovolcanoconiosis**, a type of lung disease caused by inhaling very fine particles of silica. It has 45 letters!

Here's a breakdown of the word:

* **Pneumono-** refers to the lungs
* **Ultramicro-** means extremely small
* **Scopic-** refers to a microscope
* **Silico-** refers to silica
* **Volcano-** refers to the shape of mineral deposits in the lungs
* **Coniosis** means disease of the lungs

This word was coined by Everett M. Smith, the president of the National Puzzlers' League, in 1935.

Now, don't worry if you can't remember this word. You'll rarely need to use it in everyday conversation!

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