The term 'ILEAC' is an acronym for 'ileum and cecum, ' which are two parts of the small intestine. The ileum is the longest part of the small intestine, and the cecum is a pouch-like structure at the beginning of the large intestine. Together, they make up the small intestine, which is responsible for breaking down food and absorbing nutrients. Therefore, the term 'pertaining to the small intestine' can be used to describe anything related to the ileum and cecum.