How many syllables does the longest word have?

The longest word in the English language, according to most dictionaries, is pneumonoultramicroscopicsilicovolcanoconiosis, which has 45 syllables.

It's a mouthful, isn't it? It's a made-up word that refers to a lung disease caused by inhaling very fine silica dust.

However, it's important to note that the word "pneumonoultramicroscopicsilicovolcanoconiosis" is often considered more of a novelty or a curiosity than a commonly used word.

There are many other words in the English language that are quite long, but they are generally not as long as this one.