1. Longest words in the English language:
* Pneumonoultramicroscopicsilicovolcanoconiosis: 45 letters! It's a real word, describing a lung disease caused by inhaling very fine silica dust.
* Floccinaucinihilipilification: 29 letters. This one means "the act of estimating something as worthless."
* Antidisestablishmentarianism: 28 letters. A mouthful of a word meaning "opposition to the separation of church and state."
2. Longest words by number of letters:
* Longest word in any language: "The chemical name of Titin": This is a protein with a whopping 189,819 letters! It takes over three hours to pronounce!
* "Methionylthreonylthreonylglutaminylarginyl...glycylalanylalanine": This is a protein with 1,913 letters. It's a specific sequence of amino acids.
3. Longest words by sheer length, regardless of language:
* "Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu": This Māori place name clocks in at 85 letters! It's actually the name of a hill in New Zealand.
So, what's the answer? It depends on what you're looking for! If you want the longest English word, "Pneumonoultramicroscopicsilicovolcanoconiosis" is a good contender. If you're looking for the absolute longest word, regardless of language, then "The chemical name of Titin" wins!