No, wash is the swell of "woooosh" that builds or erupts from the cymbal- usually mid range white noise sound.
Trash is dark, Far East sound, like a wuhan Chinese cymbal but in a non- China type, it is just a layer of the sound. Depending on who's describing a cymbal, it can be dark (which I equate to lower range undertones) or trashy by the definition above.
A cymbal with a strong stick (usually a ride) shows clear definition of each tip strike on the cymbal. Weak stick may start strong and then be one hurried under the wash as it develops while riding. My old 22 did that before Justin fixed it.
A ride with a good crash is one where I can be riding along and drop the shank of the stick into the cymbal and get a nice accent that gets out of the way fairly quickly
Dry cymbals tend to have more stick and less sustain and/or wash. I'm not a fan of the heavy unlathed cymbals going for "super dry"- I think it sounds like playing on a school desk.
Bells should be generous. They add to the overall sound profile and just because a cymbal is labeled "crash" does not mean you can't ride it or use that bell either to carry the groove or simply accent it.
Patina. Meh. If a cymbal sounds too dark, choked and dirty, it probably is. I had a friend who was afraid to clean his K Con cymbal because he thought it would reduce the value I said: based on what you are describing and the way it looks, it needs a cleaning. You can either flip it a possibly take a loss or clean it and see what happens. It's your cymbal- drill holes and out rivers in it if you want! After cleaning g it sounds just the way he wanted it- and not surprising just the way it was intended to sound.