BT Ḥul 8b(37) :דדייב תרבא ובלע בישרא‏ : the (forbidden) fat flows (from above), and the meat absorbs (it)
See the entire entry for traḇ, tarbā n.m. animal fat

BT Ḥul 8b(37) :כי תריצי‏ : when they (the pieces of meat) are straight (not piled up)
See the entire entry for trīṣ adj. erect; correct