What is the longest word in English?

What is the longest word you know in English?
I looked on the Internet and found a word that is 189 letters long,
but it is a chemical name. How about you?
What is the longest word in English that you know?

Panyapong 026

I just know that the identity of the longest word in English
depends upon the definition of what constitutes a word in the English language,
as well as how length should be compared.
In addition to words derived naturally from the language's roots
(without any known intentional invention),
English allows new words to be formed by coinage and construction;
place names may be considered words;
technical terms may be arbitrarily long.
Length may be understood in terms of orthography and number of written letters,
or (less commonly) phonology and the number of phonemes.



Akkaradet 067 3EN

I search on the internet I looked the word about Pneumonoultramicroscopicsilicovolcanocon... is, according to the Oxford English Dictionary,
"a word alleged to mean 'a lung disease caused by the inhalation of volcanic ash,
causing inflammation in the lungs.'"
Oh! I know it's new word.



Jiraprapa 015 4EN