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Peptic is an adjective that refers to any part of the body that normally has an acidic lumen, or is related to or promotes digestion. 'Peptic' is medical and veterinary terminology, most often used in the context of humans.
The peptic areas of the human body under normal circumstances are the stomach and duodenum. A person with gastroesophageal reflux disease may have an acidic esophagus, particularly at the inferior (lower) end. Also, a person with a Meckel's diverticulum may have cells that produce acid within the diverticulum and therefore may be prone to peptic ulcers and perforation.
A person with an unusual anatomy, such as one who has had a gastrectomy or an esophagectomy with transplantation of the ileum to replace the esophagus, may experience acidity in parts of the body that would not normally be acidic.
In all normal humans and in almost all humans, only the gastrointestinal tract is peptic.