It is often used as a prefix in scientific and medical terms, for example:
* Podiatry: The branch of medicine concerned with the diagnosis, treatment, and prevention of disorders of the foot, ankle, and lower leg.
* Podocyte: A specialized cell in the kidney that filters blood.
* Podophyllin: A drug used to treat certain skin conditions, such as warts.
So, when you see "podos" in a word, it usually refers to something related to the foot.