DR KLEPP
When a person has just eaten a meal and the food is now in the stomach, on opening the stomach would appeared to be undigested.  One can on occasion actually identify what the person has eaten, one might for instance see rice particles or peas or meat.  I don't in this specific instance exactly say what was in the stomach, but it appeared undigested, in other words it looked as though it had just been swallowed.  Had it had a more fluid consistency and had undergone digestion, I would have called it partially digested food.