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.
This constant state of. moisture encourages the growth of bacteria, molds and mildew, which form into toilet. bowl rings and the other staining and discoloration. Minerals in the water supply and. even the chemicals used to clean can lead to toilet bowl rings and the staining and.