He is conducting a study on pornography.

Portuguese Guinea was once a Portuguese colony in Africa.

This shirt is made of polynosic, so it's very soft and comfortable.

An opossum is a nocturnal animal.

Porphyrin is a compound that plays an important role in the body.

In organic chemistry, porphin plays an important role.

My new apartment is on the third floor of the co-op.

In Greek mythology, Apollo was the god of music and prophecy.

Polyhymnia is a goddess in Greek mythology.

Melpomene is the goddess of tragedy in Greek mythology.