 Thus is it written by Maimonides, and by Rabbi Yitzhak Alfasi, as also the author of "Halachot Gedolot".Included in this [category] is the suet which [clings] to its side, spreading itself upon the flanks at both sides of the animal.As for the meaning of "Aqlivusta," Rashi has explained [it as being] the small bone lying on that bone which, [in French], is called "hanche" (haunch or hip), and [which is] connected to the vertebrae of the tail [of the sheep].