The linea terminalis is a boundary or ridge that separates the pelvic cavity from the abdominal cavity. This anatomical structure is also known as the pelvic brim or pelvic inlet. There are several synonymous terms for the linea terminalis, including the pelvic rim, iliopectineal line, arcuate line, and pelvic girdle. These terms are commonly used in medical literature and anatomy textbooks to describe the boundary of the pelvic cavity. It is important for healthcare professionals and anatomy students to understand the synonyms of the linea terminalis to accurately communicate and understand medical terminology.