Joke on me. I thought it was related to "alopecia = baldness", But no, it means "fox-like".
I expect trouble finding etymology of that.

Well, I'll be doubledipped in dung, look at this:
alopecia
n.
5L, baldness, fox mange < Gr albpekia < albpcx, a fox6 loss of hair, esp. on the head; baldness