PTBes 60.c:37[2] :בוכנה דו כתת ביה‏ : a pestle, because he pounds with it
See the entire entry for būḵān, būḵānā n.m. pestle

PTBes 60.c:37[2] :דו כתת ביה‏ :
See the entire entry for ktt vb. to pound, to crush