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[noo-muh-noh-uhl-truh-mahy-kruh-skop-ik-sil-i-koh-vol-key-noh-koh-nee-oh-sis, nyoo-] /ˈnu mə noʊˌʌl trəˌmaɪ krəˌskɒp ɪkˈsɪl ɪˌkoʊ vɒlˌkeɪ noʊˌkoʊ niˈoʊ sɪs, ˈnyu-/
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Origin of pneumonoultramicroscopicsilicovolcanoconiosis
< New Latin; see pneumono-, ultramicroscopic, silica, volcano, (pneumono)coniosis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for pneumonoultramicroscopicsilicovolcanoconiosis

supposedly the longest word in a dictionary, an artificial word said to mean a lung disease caused by the inhalation of silica dust's 21st Century Lexicon
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Word Origin and History for pneumonoultramicroscopicsilicovolcanoconiosis

1962, "A facetious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust' but occurring chiefly as an instance of a very long word" [OED]. Said in an early reference to have been invented by seventh grade students in Norfolk, Virginia.

Online Etymology Dictionary, © 2010 Douglas Harper
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