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This 1185-letter "word" is the chemical name for "Coat Protein, Tobacco Mosaic Virus, Dahlemense Strain". It is supposedly the longest word in the English language.
The term was published in the American Chemical Society's Chemical Abstracts in 1972, and is considered by some to be the longest real word. It does hold the record for the longest word published in an English language publication in a serious context — that is, for some reason other than to publish a very long word.
Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu is the Māori name for an otherwise unremarkable hill, 305 metres high, close to Porangahau, south of Waipukurau in southern Hawke's Bay, New Zealand. The name is often shortened to Taumata by the locals for ease of conversation.
Pneumonoultramicroscopicsilicovolcanoconiosis.ogg, also spelled -koniosis) is, according to the Oxford English Dictionary, "a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust found in volcanoes'." It was coined to serve as the longest English word. The more general and widely used term for this condition is pneumoconiosis.
Pseudopseudohypoparathyroidism is an inherited disorder that closely simulates the symptoms, but not the consequences of pseudohypoparathyroidism, thus it has mild or no manifestations of hypoparathyroidism or tetanic convulsions.
Floccinaucinihilipilification is "the act or habit of estimating or describing something as worthless, or making something to be worthless by deprecation".