Yes, this is actually a dictionary. It was surprisingly tedious to read, and reading the whole thing is probably one of the more stupid things I've done. On the other hand, once I got started, I just kinda slogged through it. It's actually been fairly useful, though, since it's given me a bit more of a rounded knowledge of the subject (at least in the abstract). I managed to surprise a friend with my knowledge of what a "crack spread" was. Oh joy. Ahem.
On the other hand, this is a pretty rubbish book. It's ten years old now, so many of the terms and derivative types are out of date. In the areas I have specialisation in, I can tell the definitions are pretty loose. There are equations which don't actually work. There are typos. This is not good for something which is trying to be definitive.