According to this site it says that molting is to make room for more growth (grows too big for skin) and shedding is for seasonal changes (spring warm, fall cold). I'd say molting though the term shedding is used a lot on this forum.
http://animals.pawnation.com/shedding-vs-molting-3343.html
Say wha????:confused: Sorry but yes I am a dude! My name is Patrick and PattyCake was a nickname for years around friends and family. Hope that clears things up a little;)