Long words

Pneumonoultramicroscopicsilicovolcanoconiosis 
Oxford English Dictionary: it is “an artificial long word said to mean a lung disease caused by inhaling very fine ash and sand dust.”
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In Portuguese, (wikipedia says that, and I believe) the longest word is
Pneumoultramicroscopicossilicovulcanoconioticozinhos
presumably, it’s the Portuguese version of pneumonoultramicroscopicsilicovolcanoconiosis. . .  The longest word that I know how to speak is
Anticonstitucionalissimamente