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pneumonoultramicroscopicsilicovolcanoconiosis
pneumonoultramicroscopicsilicovolcanoconiosis n. 
/n(j)uˌmɑnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs/, /ˌn(j)umənoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs/, /ˌn(j)umənoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs/, /n(j)uˌmoʊnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs/, /n(j)uˌmoʊnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs/ (also pneumonoultramicroscopicsilicovolcanokoniosis) [compare pneumonoconiosis n.] a word invented (probably by Everett M. Smith (born 1894), president of the National Puzzlers' League in 1935) in imitation of polysyllabic medical terms, alleged to mean ‘a lung disease caused by the inhalation of very fine sand and ash dust’ but occurring only as an instance of a very long word.
Brit. /ˌnjuːmənəʊˌʌltrəˌmʌɪkrəˌskɒpɪkˌsɪlᵻkəʊvɒlˌkeɪnəʊˌkəʊnɪˈəʊsɪs/
, /ˌnjuːmənəʊˌʌltrəˌmʌɪkrəˌskɒpɪkˌsɪlᵻkəʊvɒlˌkeɪnəʊˌkəʊnɪˈəʊsɪs/U.S. /n(j)uˌmɑnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs/
, /n(j)uˌmɑnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs//n(j)uˌmɑnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs//ˌn(j)umənoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs//ˌn(j)umənoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs//n(j)uˌmoʊnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɔlˌkeɪnoʊˌkoʊniˈoʊsəs//n(j)uˌmoʊnoʊˌəltrəˌmaɪkrəˌskɑpɪkˌsɪləkoʊvɑlˌkeɪnoʊˌkoʊniˈoʊsəs/ΘΚΠ
the world > health and disease > ill health > a disease > disorders of internal organs > disorder of respiratory organs > [noun] > disorders of lungs > caused by dust or fibre
stone-cutter's disease or phthisis1540
phthisis1821
black lung1837
anthracosis1838
shoddy fever1851
potter's consumption1863
siderosis1869
collier's phthisis1871
iron lung1872
chalicosis1878
pneumonoconiosis1878
tabacosis1879
byssinosis1881
pneumoconiosis1881
silicosis1881
potter's rot1895
fur-fever1905
stonemason's lung1905
asbestosis1927
anthracosilicosis1929
pneumonoultramicroscopicsilicovolcanoconiosis1935
bagassosis1941
bagasse1943
berylliosis1943
thesaurosis1958
1935 N.Y. Herald-Tribune 23 Feb. 3/2 Pneumonoultramicroscopicsilicovolcanokoniosis succeeded electrophotomicrographically as the longest word in the English language recognized by the National Puzzlers' League at the opening session of the organization's 103d semi-annual meeting held yesterday at the Hotel New Yorker.
1936 F. Scully Bedside Manna 87 Pneumonoultramicroscopicsilicovolcanakoniosis [sic], a disease caused by ultra-microscopic particles of sandy volcanic dust, might give even him laryngitis.
1966 Word Study Oct. 7/2 The resources of Greek have enriched the modern world as well as the ancient one. Perhaps this is most dramatically illustrated by the longest and most fantastic word now in an English dictionary (the Merriam-Webster's great Unabridged) which is forty-five letters in length: pneumonoultramicroscopicsilicovolcanoconiosis,..meaning ‘a disease of the lungs caused by extremely small particles of ash and dust’.
1973 R. E. Megarry Second Miscellany-at-law 160 It has been said that ‘floccinaucinihilipilification’ is the longest word in the English language... The word's proud title must yield to some technical terms, such as pneumonoultramicroscopicsilicovolcanokoniosis.
2001 Eng. Jrnl. 91 90/2 I love to tell the students their first vocabulary word is pneumonoultramicroscopicsilicovolcanoconiosis and watch them scramble for their pencils to copy it down.
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