What do YOU call your Biological Mother?

I tend to prefer biological mother, although here, I refer to her as a birthmom as that seems the most common. I realize some may feel the biological is to cold or scientific, but I don't think of it that way. She's the woman who I am realated to biologically. We share DNA. That's a pretty cool relationship if you ask me.Of course, I'm not in reunion either, so my feelings could change drastically if that ever happens.