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  1. Longest word in English - Wikipedia

    The longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis (45 letters), a word that refers to a lung …

  2. The Longest Long Words List - Merriam-Webster

    Sep 2, 2025 · The longest word entered in most standard English dictionaries is Pneumonoultramicroscopicsilicovolcanoconiosis with 45 letters. Our definition is "a lung …

  3. The Longest English Word (189,819 Letters): Facts and Explanation

    Aug 11, 2025 · The longest word in the English language is a chemical name for a protein called Titin. At 189,819 letters long, it is a scientific name, not a word you would ever use in …

  4. 10 Longest Words In The World - Lingopie

    May 28, 2025 · Longest English Word: "Pneumonoultramicroscopicsilicovolcanoconiosis" holds the record for the longest word in English, often cited for its length and complexity.

  5. The 10 longest words in the world | The AltaLingua Blog

    ‘Titin”: the world’s longest word is the full chemical name of titin, an extremely large protein. Its technical name contains 189,819 letters and stands for the sequence of amino acids of which …

  6. Top 10 Longest Words In The World | Guinness Record Holders

    May 19, 2025 · Have you ever heard of a word so long it could challenge your memory? Pneumonoultramicroscopicsilicovolcanoconiosis is not just any old medical term; it’s the …

  7. Discover What Is the Longest Word in the World - Rosetta Stone

    Apr 21, 2025 · According to the Guinness World Records, the longest word in the world is a 195-character Sanskrit word from the 15th-century work titled Varadambika Parinaya. The entire …

  8. Longest Word In English: The 189,000-Letter Behemoth

    Oct 29, 2025 · The longest word in the English language is a 189,819-letter chemical name for the protein titin. While it's not exactly practical for everyday use, it's a fascinating example of the …

  9. The Longest Word in the Dictionary | Britannica Dictionary

    Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word entered in the most trusted English dictionaries. The definition is "a lung disease caused by inhalation of very fine silicate …

  10. Longest word - Guinness World Records

    The longest known example is a compound 'word' of 195 Sanskrit characters (transliterating to 428 letters in the Roman alphabet) which appears in Varadambika Parinaya, a 16th-century …