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.

Pronunciation:

pneumonoultramicroscopicsilicovolcanoconiosis

/ˌnjuːmə(ʊ)nəʊˌʌltrəˌmʌɪkrə(ʊ)ˈskɒpɪkˌsɪlɪkəʊvɒlˌkeɪnəʊˌkəʊnɪˈəʊsɪs/