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Pneumonoultramicroscopicsilicovolcanoconiosis (/ ˌ nj uː m ə n oʊ ˌ ʌ l t r ə ˌ m aɪ k r ə ˈ s k ɒ p ɪ k ˌ s ɪ l ɪ k oʊ v ɒ l ˌ k eɪ n oʊ ˌ k oʊ n i ˈ oʊ s ɪ s / ⓘ [1] [2]) is a 45-letter word coined in 1935 by the then-president of the National Puzzlers' League, Everett M. Smith.
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In 1902, the ultramicroscope was developed by Richard Adolf Zsigmondy (1865–1929) and Henry Siedentopf (1872–1940), working for Carl Zeiss AG. [1] Applying bright sunlight for illumination they were able to determine the size of 4 nm small nanoparticles in cranberry glass.
The identity of the longest word in English depends on the definition of "word" and of length.. Words may be derived naturally from the language's roots or formed by coinage and construction.