Google providing me with definitions was troubling, but online dictionaries are sub-optimal. Google giving me instant conversions was so handy that I didn't care.
But etymologies are handled nicely by http://www.etymonline.com/ and it's sad to think they're going to get a lot less traffic now.
It has Pyrex, but just says it's an invented word.
Pyrex is invented, but comes from Pyro (Fire) + Rex (King), which makes the use of it for heat proof glass easier to understand.
The new Google feature is really neat. I'm uneasy about these things being built into Google rather than Google pointing people to other websites.