[i]Floccinaucinihilipilification[/i] is the longest non-medical word in the English language.
Noun:
The act of estimating something as worthless.
[spoiler]Ironic, being that the word is useless and it's only use is novelty. It was made up in order to achieve its place as the longest non-medical word.[/spoiler]
English
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Also hippopotomonstrosesquipedaliophobia is the fear of long words