The term 'ileac' is an adjective used to describe something that is related to the small INTESTINE. It is derived from the Latin word ileum, which means 'INTESTINE'. The small INTESTINE is a part of the digestive system and is responsible for absorbing nutrients from food. It is the longest part of the gastrointestinal tract and is divided into three sections: the duodenum, jejunum, and ileum. The ileum is the last section of the small INTESTINE and is where most of the nutrient absorption takes place.