Apparently True

The longest word in the English language, as verified by the Oxford English Dictionary, has 45 letters

The longest word in the English language is "pneumonoultramicroscopicsilicovolcanoconiosis," a type of lung disease caused by inhaling silica particles. The word was coined by Everett M. Smith, the president of the National Puzzlers' League, in 1935. It is a combination of Greek and Latin roots, and is often used as an example of a very long word in language learning materials.