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The longest word in English depends upon the definition of what constitutes an English word. English allows new words to be formed by construction; long words are coined; place names may be considered words; technical terms may be arbitrarily long. Length can be in terms of orthography and number of written letters or phonology and the number of phonemes.



Word
Length
Pros
Cons

Methionylthreonylthreonyl...isoleucine
189,819 letters
Longest full chemical name of a protein[1]
Technical; not in a major dictionary

Lopado...pterygon
183 letters
Longest word coined by a major author[2]
Coined; not in a major dictionary

Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu
85 letters
Longest officially recognized place name[3]
Place name; not in a major dictionary

Pneumonoultramicroscopicsilicovolcanoconiosis
45 letters
Longest word in a major dictionary[4]
Technical; coined to be the longest word

Pseudopseudohypoparathyroidism
30 letters
Longest non-coined word in a major dictionary
Technical

Floccinaucinihilipilification
29 letters
Longest nontechnical word

在主要的英文字典中，最長的單字是pneumonoultramicroscopicsilicovolcanoconiosis，由45個字母組成，意思應該是一種肺部疾病， 矽肺病。后来研究者认为这是一个骗局.