What is the longest word you know in English?

Question

Floccinaucinihilipilification means the action or habit which is consider to be worthless. Is there any other word bigger than this?

Answer 1

pseudopseudohypoparathyroidism 

Answer 2

Pneumonoultramicrosilicovolcanoconiosis...

Answer 3

Supercalifragilisticexpialidocioius