Little Hawk, you have raised an interesting question. What is the last word in my unabridged dictionary?

The last word is 'Zyzzogeton,' a genus of South American leafhoppers.

Naturally I thought some entomologist had named this genus for his Transylvanian thesis advisor, Prof. Zyzzog. But no, they think it came from the Spanish word for zigzag, which is 'ziszas.'

So now I have learned something new. Thanks.