The longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis (45 letters), a word that refers to a lung …

Sep 2, 2025 · The longest word entered in most standard English dictionaries is Pneumonoultramicroscopicsilicovolcanoconiosis with 45 letters. Our definition is "a lung …

May 11, 2025 · Take your vocabulary to the next level with this list, featuring 13 of the longest words in the English language.

Many of the longest words in the dictionary refer to medicine or chemistry. You’ll find a few defined in here along with other long words that you may or may not already use. Here’s how …

Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word entered in the most trusted English dictionaries. The definition is "a lung disease caused by inhalation of very fine silicate …

Aug 19, 2025 · Prepare to challenge your memory and discover the jaw-dropping lengths of the longest words in English.

Mar 24, 2025 · Definition: Yep, there’s a word out there that’s almost 190,000 letters long. Technically speaking, it’s not truly a word—it’s actually the chemical name for a protein.

May 29, 2025 · The longest word in the Oxford English Dictionary is 45 letters: pneumonoultramicroscopicsilicovolcanoconiosis. According to the OED, this synonym for …

Aug 3, 2025 · Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word found in major English dictionaries, with 45 letters. It refers to a rare lung disease caused by inhaling fine …

This is the ultimate list of the 150 longest long words in the English language.