It comes from the Greek word "kanthos", which means "corner" or "angle".
Here are some examples of medical terms using the root word cantho:
* Canthoplasty: Surgical repair of the eyelids, particularly the corner of the eye.
* Canthal ligament: A ligament that helps support the eyelids and the corner of the eye.
* Canthotomy: A surgical procedure that involves cutting the eyelid at the corner of the eye.