Morphology

I set "Types of Morphemes" - the third chapter of Morphology by Katamba and Stonham - as preparatory reading for our week 4 IA902 session, but perhaps we need a few definitions before you start reading.  For those of you who would like to participate as blog authors, can you write a post explaining how you would define the terms MORPHOLOGY and MORPHEME?  You can either define these terms in your own words, or present definitions that you like from other authors, but if you take the latter option, please make it clear where your definition originates.