The "equator of the eyeball" typically refers to the area around the middle of the eye, also known as the equator region. This region houses various anatomical structures crucial for vision. While there are no direct synonyms for this specific term, other phrases may be used to describe this particular part of the eye. Alternatives could include "middle ring of the eyeball", "central zone of the eye" or "circumference area of the ocular globe". These terms showcase different ways to depict the same anatomical location, providing a broader understanding and various ways to refer to this specific region of the eye.