Albedo in English is something else. One wonders if the name should have followed the meaning instead? (If such it was)
Definition of albedo : reflective power [specifically : the fraction of incident radiation (such as light) that is reflected by a surface or body (such as the moon or a cloud)]
@xfaca - still not pith, I was going to say, until I was corrected XD
"Sweet oranges grow in a range of different sizes, and shapes varying from spherical to oblong. Inside and attached to the rind is a porous white tissue, the white, bitter mesocarp or albedo (pith)"