Ok smartypants, put your hand down. It's antidisestablishmentarianism, right? Maybe not. Robert Krulwich explains.
Compare with the Wikipedia entry on long words, which contains this glorious non-word:
Science writer Sam Kean, in his book The Disappearing Spoon, worked really hard on this and after much sleuthing, he landed on a word that comes not from dancing English nannies but from virus-hunting scientists. It's a protein, found in a virus, but this is a very dangerous, economically important virus, the first ever discovered.