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There is considerable debate around what is considered a "legal word" when deciding what the longest English word is.

The longest non-technical, non-contrived word seems to be "antidisestablishmentarianism", which is a political philosophy opposed to the removal of the Church of England from official status.

The slightly longer "pseudopseudohypoparathyroidism" is a technical term for a genetic anomaly that presents as resistance to parathyroid hormones.

"pneumonoultramicroscopicsilicovolcanoconiosis" is a made-up word, invented solely to be the longest word. It does appear in some dictionaries, where it means "pneumoconiosis caused by inhalation of volcanic ash."

The longest word ever published contains 1909 letters. It is a type of protein, and the name follows a standard naming convention for naming proteins. The largest known protein, "Titin", if written using the standard system, would contain 189,819 letters. Titin is a component of muscle fiber.

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11y ago

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