I’m always interested in quirks in the English language. So when I found an article “What’s the Longest Word in English?” on the Pocket website (https://getpocket.com/explore/item/what-s-the-longest-word-in-english?), I was intrigued.

I know the Welsh language is famous (infamous?) for long words; see “The Longest Words in the Welsh Language” (https://talkpal.ai/the-longest-words-in-the-welsh-language/). And of course there is antidisestablishmentarianism (which I will leave you to figure out).

But according to the Pocket article, the longest defined word in any English dictionary is pneumonoultramicroscopicsilicovolcanoconiosis. Not that you would ever expect to use it in a conversation: it’s “a disease that causes an inflammation of the lungs due to the inhalation of very fine silicate or quartz dust.” But at least now you know.

By the way, if this topic interests you, the “longest defined word” link will lead you to eleven others.