isulisul noun English. The lower extremity of the breastbone: xyphoid process. Example sentence: Subanen. Sa' daw mbali'i gisulisul ta, piligru gupia pu' mekepatay. Ki gisulisul tulan di tanda' gabusabus. English. They say that if we fracture our sternum, it's very dangerous, because it can cause death. The sternum is a bone where our epigastrium is.