What is the English language’s longest word? Though the longest word in the English dictionary is Pneumonoultramicroscopicsilicovolcanoconiosis, the name for a disease caused by the inhalation of quartz dust in the lungs, there are some words even longer than that. An example of that is the 189,819 letter word that takes up to 3 hours to read aloud.
That word is: Methionyl​threonyl​threonyl​glutaminyl​alanyl​prolyl​threonyl​phenyl​alanyl​threonyl​glutaminyl​prolyl​leucyl​glutaminyl​seryl​valyl​valyl​valyl​leucyl​glutamyl​glycyl​seryl​threonyl​alanyl​threonyl​phenyl​alanyl​glutamyl​alanyl​histidyl​isoleucyl​seryl​glycyl​phenyl​alanyl​prolyl​valyl​prolyl​glutamyl​valyl​seryl​tryptophyl​phenyl​alanyl​arginyl​aspartyl​glycyl​glutaminyl​valyl​isoleucyl​seryl​threonyl​seryl​threonyl​leucyl​prolyl​glycyl​valyl​glutaminy….
The word actually goes on for another 189,361 letters, and the full word can be found here. The word is a series of amino acids that form the protein structure for titin. Titin is a protein in the human body, responsible for helping muscles to contract and relax. The reason for this abnormally long word is due to the fact that the protein consists of 35,000 amino acids, all of which need to be named.
The word was never truly named the English language’s longest word, mostly due to the fact that it is not set into any trusted dictionary such as the Merrium Webster or Oxford English dictionary. That does not make it a fake word, it only means there is no reason to put the word in because it is too specialized and does not have a definition that makes it usable in conversation.