The longest dictionary word in English is none other than pneumonoultramicroscopicsilicovolcanoconiosis, a 45-letter word that can be seen in such dictionaries as Chambers. It is the name of a lung disease caused by inhaling dust particles in mines.

The longest mania-word in English is hyperpolysyllabicomania (excessive fondness for big words).

The longest phobia-word in English is hippopotomonstrosesquiapedaliophobia (fear of very long words)

The best-known longest word in English is antidisestablishmentarianism (the belief which opposes removing the tie between church and state).

The longest word used by William Shakespeare is honorificabilitudinitatibus (with honorableness).

The longest words in common use are disproportionableness and incomprehensibilities.

The longest -ology word in English is ophthalmootorhinolaryngology.

[from O.Abootty's The Book of Word Records. This book is now out of print and will be available in a month under the title Word Magic. The book is low-priced. If you want a copy of it, please send an email to Email Removed]

That's interesting. Thanks for sharing! Emotion: smile
I like all the words...and I even try to pronounce it..

Thanks for sharing, I will take a note.
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you are missing the longest word known to man in english