Dialysis??? Who knows... Why don't you call your education department. Or better yet, go back to that manager and say "excuse me, I didn't understand wth you were talking about when you asked me about the diaphresis(???) class. Could you spell it so I can go look it up?".
The quickest way to kill a patient is to act like you know something (for fear of embarrassment) when you don't know.
My wife is an MSN/Nurse Midwife of over 20 years currently working on her PhD in education with a nursing focus. She now teaches an NCLEX review course, so she knows EVERYTHING. I'm an RN of 5 years with an associates degree. It always surprises me a little and I'm proud of her for this but whenever I say a word that she doesn't know, she always says without hesistation "what does that mean, I've never heard that word". And this is not only clinical terms but just words in general conversation.
So the moral of the story is: if you don't know, you better ask somebody... somebody there at your own facility.