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Definition of pneumonoultramicroscopicsilicovolcanoconiosis in English:
pneumonoultramicroscopicsilicovolcanoconiosis
noun
mass noun
An invented long word said to mean a lung disease caused by inhaling very fine ash and sand dust.
‘Thus, pneumonoultramicroscopicsilicovolcanoconiosis is a disease of the lungs resulting from the inhalation of very fine silicate or quartz dust’
‘Pneumonoultramicroscopicsilicavolcanoconiosis is a form of the illness pneumoconiosis, caused by the inhalation of a fine silica dust found in most volcanoes.’
Origin
1930s: a word invented (probably by Everett M. Smith, president of the National Puzzlers' League) in imitation of very long medical terms.