pneumonoultramicroscopicsilicovolcanoconiosis

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pneumonoultramicroscopicsilicovolcanoconiosis

  • /ˌnjuːmə.nəʊ.ʌl.tɹə.maɪ.kɹəʊˌskɒ.pɪkˌsɪ.lɪ.kəʊ.vɒl.keɪ.nəʊ.kəʊ.niˈəʊ.sɪs/ UK
  • /nuˌmɑ.noʊ.ʌl.tɹə.maɪ.kɹoʊˈskɑ.pɪkˌsɪ.lɪ.koʊ.vɑl.kæ.noʊ.kä.niˈoʊ.sɪs/ US
  • /nuˈmɑ.noʊˌʌl.tɹə.maɪ.kɹoʊˈskɑ.pɪkˈsɪ.lɪ.koʊ.vɑlˌkeɪ.noʊ.koʊ.niˈoʊ.sɪs/ US

Rhymes with -əʊsɪs

Where it comes from

Coined by American puzzle designer and newspaper editor Everett Smith, President of the National Puzzlers' League, at their convention in 1935 as a deliberately long word. An extension of the medical term pneumonoconiosis (by surface analysis, pneumono- (“lung”) + coniosis (“disease caused by the inhalation of dust”)) with ultramicroscopic + silico- + volcano inserted between the two elements.

noun pneumono­ultra­microscopic­silico­volcano­koniosis · pneumon­ultra­microscopic­silico­volcano­coniosis

  1. nonce word, uncountable A disease of the lungs, allegedly caused by inhaling microscopic silicate particles originating from the eruption of a volcano. Call it miner's asthma, silicosis, pneumonoultramicroscopicsilicovolcanoconiosis, coal workers' pneumoconiosis, or black lung—they are all dust diseases with the same symptoms.

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MLA

"pneumonoultramicroscopicsilicovolcanoconiosis." Wiktionary, via Micwyn, micwyn.com/word/pneumonoultramicroscopicsilicovolcanoconiosis. Accessed 7 Nov. 2026.

APA

pneumonoultramicroscopicsilicovolcanoconiosis. (n.d.). In Wiktionary, via Micwyn. Retrieved November 7, 2026, from https://micwyn.com/word/pneumonoultramicroscopicsilicovolcanoconiosis

Chicago

"pneumonoultramicroscopicsilicovolcanoconiosis." Wiktionary, via Micwyn. Accessed November 7, 2026. https://micwyn.com/word/pneumonoultramicroscopicsilicovolcanoconiosis.

BibTeX
@misc{pneumonoultramicroscopicsilicovolcanocon_2026,
  title = {pneumonoultramicroscopicsilicovolcanoconiosis},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/pneumonoultramicroscopicsilicovolcanoconiosis},
  urldate = {2026-11-07}
}