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Methionylthreonylthreonylglutaminylarginyl...isoleucine 189,819

Methionylthreonylthreonylglutaminylarginyl...isoleucine

189819 letters

chemical name for titin (largest known protein)

Technical; not in dictionary; disputed whether it is a word

Lopadotemachoselachogaleokranioleipsano...pterygon

183 letters

longest word coined by major author

Coined; not in dictionary; Greek transliteration

Pneumonoultramicroscopicsilicovolcanoconiosis

45 letters

longest word in English dictionary

disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs

technical; coined to be the longest word

Pseudopseudohypoparathyroidism

30 letters

longest non coined word

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Wiki User

12y ago
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Wiki User

13y ago

1. pneumonoultramicroscopicsilicovolcanokoniosis

2. hippopotomonstrosesquipedaliophobia

3. supercalifragilisticexpialidocious

4. pseudopseudohypoparathyroidism

5. hippopotomonstrosesquipedalian

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Lesith Dasanayake

Lvl 3
1y ago

Methionylthreonylthreonylglutaminylarginyl...isoleucine

Lopadotemachoselachogaleokranioleipsano...pterygon

Pneumonoultramicroscopicsilicovolcanoconiosis

Pseudopseudohypoparathyroidism

Floccinaucinihilipilification

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Wiki User

13y ago

Anti-dis-establish-mentarianism and super-cala-fraga-listic-s.-p.-ali-docious

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Q: What are the five longest words in English?
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The 45 letter word Pneumonoultramicroscopicsilicovolcanoconiosis is the longest constructed word that appears in major dictionaries. Antidisestablishmentarianism, at 28 letters, is the longest non-technical English word.


What are the five longest words in the English dictionary?

The five longest words in the English dictionary are pneumonoultramicroscopicsilicovolcanoconiosis, pseudopseudohypoparathyroidism, floccinaucinihilipilification, antidisestablishmentarianism, and honorificabilitudinitatibus.


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What is the longest word in English that has 45 words?

Do you mean 45-letter word?Pneumonoultramicroscopicsilicovolcanoconiosis