Pneumonoultramicroscopicsilicovolcanoconioses

pneumonoultramicroscopicsilicovolcanoconiosis

[noo-muh-noh-uhl-truh-mahy-kruh-skop-ik-sil-i-koh-vol-key-noh-koh-nee-oh-sis, nyoo-]
noun
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:
< Neo-Latin; see pneumono-, ultramicroscopic, silica, volcano, (pneumono)coniosis

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

pneumonoultramicroscopicsilicovolcanoconiosis
"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]
Online Etymology Dictionary, © 2010 Douglas Harper
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