Which of the following defines the term "enteral"?

The term "enteral" specifically refers to the administration of substances through the digestive tract. This includes methods such as oral, sublingual, and rectal routes, where the substance enters the gastrointestinal system to be absorbed. Enteral administration allows for the utilization of the body's natural digestive processes, making it a common route for medications and nutrients, especially when the oral route is preferable.

Other definitions that could be considered relate to different routes of administration. For instance, anything outside the digestive tract is termed "parenteral," while injections specifically fall under parenteral administration as well. Additionally, the term “under the skin” usually describes a subcutaneous injection, which is also a form of parenteral route. Hence, the context behind the use of "enteral" clearly supports the definition associated with the digestive system.