The longest phrase within the English language, based on the Oxford English Dictionary, is “pneumonoultramicroscopicsilicovolcanoconiosis,” a 45-letter phrase that refers to a lung illness brought on by the inhalation of very high quality silica mud, normally present in volcanoes.
It’s tough to say the phrase, this may be divide in syllables “pneu-mo-no-ul-tra-mi-cro-sco-pic-sili-co-vol-ca-no-co-ni-o-sis”. No matter its size and complexity, it’s a fascinating instance of the range and richness of the English language.