The Collaborative International Dictionary of English v.0.48:

Steatopyga \Ste`a*top"y*ga\ (-t[o^]p"[i^]*g[.a]), n. [NL., fr.
   Gr. ste`ar, ste`atos, fat + pygh` the buttocks.]
   A remarkable accretion of fat upon the buttocks of Africans
   of certain tribes, especially of Hottentot (Khoikhoi) women.
   [1913 Webster]