Whats the most complex word you know?

Whats the most complex word you know that exists in the english langauge
Can be used to describ somthing, could be a verb, anything that exists in an english dictonary, I want to see how many people on this site
Actualy have a sophisticated vocabulary

Antidisestablishmentarianism

supercalafragalisticexpealadocies

a word, not quite as exotic as above, but neverhteless, complicate to me (becuase what it represents) is the nephron, seriously, it took me ages to muster the complexities of what it is and it's function! (god damn bowmans capsule, the glomerulus, ascending and descending convaluted tubule and then the loop of ogd damn henle!!!)

so no major spelling issues, just meanings... (however, I got a C for my anatomy and physiology exam, so I'm happy )

onus