I know the longest English word (310 letters) isOriginally Posted by Darobat
"ornicopytheobiblopsychocrystarroscioaerogene
thliometeoroaustrohieroanthropoicichthyopyrosid
erochpnomyoalectryoophiobotanopegohydrorhab
docrithoaleuroalphitohalomolybdoclerobeloaxinoco
scinodactyliogeolithopessopscphocatoptrotephraoe
irochiroomychodactyloarithstichooxogeloscogastrog
yrocerobletonooenoscapulinaniac"
It means "a deluded human who practices divination or forecasting". And yes, I spelt taht from memory.
P.S. Sorry for such division, it's a bit long.