The accepted medical term for an abnormal condition of the stomach is gastropathy. Gastropathy literally means "disease of the stomach." The term "gastro" refers to the stomach, and "pathy" is derived from the Greek word "pathos," meaning disease or suffering.
The term gastritis is used when the abnormality affects the lining of the stomach specifically. The term gastroparesis means weakened stomach muscles and refers to a disease of those muscles or impairment of the nerves controlling those muscles. The word gastrosis is a general term that was once used to indicate any disease of the stomach, although it is now considered obsolete.