pneumonoultramicroscopicsilicovolcanoconiosis

 
Pronunciation: /ˌnjuːmənəʊˌʌltrəˌmʌɪkrə(ʊ)ˈskɒpɪkˌsɪlɪkəʊvɒlˌkeɪnəʊˌkəʊnɪˈəʊsɪʃ, njʊˌməʊnəʊ-/

noun

[mass noun]
  • an artificial long word said to mean a lung disease caused by inhaling very fine ash and sand dust.