According To The referred Book and Videos I will define Morphology as:
Morphology is the study of the combination of morphemes to Produce words.
a morpheme is defined as “the smallest unit of meaning in a language.” All words, since they have meaning, have at least 1 morpheme, but a word can have several morphemes. For example, the word “cat” has just one morpheme but the word “cats” has 2, as the -s denotes plurality.