This is a medical suffix that originates from the Greek [tomos] which means "to cut" or "to open". The intention is that the opening or wound made will be closed or repaired as soon as practical. Applications of this suffix include:

• Tracheotomy: Opening of the trachea
Laparotomy: Opening of the abdomen
Sternotomy: Opening of the sternum
Gastrotomy: Opening of the stomach