Why are the kidneys called metanephric? What does the term metanephric actually mean? I tried to search that on Google but couldn't find the exact meaning.
There are metanephric diseases, which refer to the location of pathologic tissue relative to the main kidney mass, but unless someone with more expertise wants to weigh in, I don't think that kidneys themselves are called metanephric.
There is also a developmental stage of the kidneys, in which they are referred to as metanephros. Perhaps you're thinking of that?