Bohdran - pronounced Bore (as in what I am) Ann (the girl's name). It's a very difficult instrument to play properly - I should know, I can't!
Ceilidh - pronounced Cale (as in Scale without the S), eee (as in key), or if you remember the Marillion song, Kayleigh, (the girl's name). An Irish party/shin dig.
As for the story behind Irish dancing, I would go along with Nolo's explanation more than Slatz's (things were around before the Brits invaded Ireland, or America was colonized
As I have been told, part of the point of keeping the upper body still is to show the level of control and balance that the dancer has - try it sometime!
Hope this helps.
But since this topic was about hands and poles, I shall make a comment to bring it back on track after Nolo's hijack (and have you noticed how she ALWAYS does that!
I learnt without poles, and I find it difficult to use them under normal circumstances. I only find them useful when someone is in front of me in the lift line, and their rear binding has a big sign saying "release me" on it.