The third trochanter, also known as the teres major tuberosity, is a small protrusion found on the femur bone. This bony prominence is located on the medial side of the bone, just below the greater trochanter. While the term "third trochanter" is the most common way to refer to this structure, it is worth noting that there are a few synonymous terms used by medical professionals. Some of these synonyms include "tertius trochanter", "tertiary trochanter", and "paratrochanter". These alternative terms are often used interchangeably to describe the same bony landmark. Regardless of the name used, the third trochanter plays a role in muscle attachments and aids in the movement and rotation of the hip joint.