noun

• An invented long word said to mean a lung disease caused by inhaling very fine ash and sand dust.

  ‘Pneumono­ultra­microscopic­silica­volcano­coniosis is a form of the illness pneumo­coni­osis, caused by the inhalation of a fine silica dust found in most volcanoes.’

  More example sentences

  • ‘Thus, pneumonoultramicroscopicsilicovolcanoconiosis is a disease of the lungs resulting from the inhalation of very fine silicate or quartz dust’