The longest phrase within the English language is “Pneumonoultramicroscopicsilicovolcanoconiosis,” which refers to a lung illness brought on by inhaling very effective silica mud, usually present in volcanoes.
The phrase was coined by American doctor and writer Everett M. Smith in 1935. It’s composed of a number of Greek roots: “pneumono” (lung), “extremely” (very), “micro” (small), “silico” (silicon), “volcano” (volcano), and “coniosis” (mud illness). The phrase is 45 letters lengthy and has been listed within the Guinness Guide of World Information because the longest phrase within the English language since 1991.
