The longest word in the English language is “Pneumonoultramicroscopicsilicovolcanoconiosis,” which refers to a lung disease caused by inhaling very fine silica dust, often found in volcanoes.
The word was coined by American physician and author Everett M. Smith in 1935. It is composed of several Greek roots: “pneumono” (lung), “ultra” (very), “micro” (small), “silico” (silicon), “volcano” (volcano), and “coniosis” (dust disease). The word is 45 letters long and has been listed in the Guinness Book of World Records as the longest word in the English language since 1991.
