What is the longuest word in English?

The longest word in English, according to the Oxford English Dictionary, is pneumonoultramicroscopicsilicovolcanoconiosis, a lung disease caused by the inhalation of very fine silica dust. It has 45 letters!

However, there are a few other contenders for the longest word in English:

* Floccinaucinihilipilification (29 letters), which means "the act of estimating something as worthless."

* Antidisestablishmentarianism (28 letters), which refers to opposition to the separation of church and state.

* Incomprehensibilities (21 letters), which refers to something that cannot be understood.

It's worth noting that these long words are mostly considered "artificial" or "rarely used." They are often used as examples of long words, but they are not common in everyday language.