teratoma. [terâ²ÉtÅâ²mÉ] pl. teratomas, teratomata. a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
The pink-colored film or ring frequently seen on showers, tubs, toilets and pet water bowls is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
A bacteria, pink algae appear as a reddish-orangeish slime, usually at a swimming pool's water line. It is also attracted to PVC surfaces in a pool, especially piping. It seems to keep company with white water mold, which is a fungus. Of all its colorful cousins, pink algae are the easiest to maintain.