BT Ḥul 52a(30) :הת׳ בוכנא בלא אסיתא הכא בוכנא ו̇א̇סיתא‏ : in that case there is a pestle without a mortar, in this case there is a pestle and a mortar [in a discussion of broken ribs and their connection to the spinal column]
See the entire entry for *ˀĕsett, ˀĕsittā (ˀĕsintā) n.f. mortar