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.
1 Pour a small amount of Listerine into the water of your humidifier in order to prevent the growth of mildew or bacteria.  Pour 1/2 cup of Listerine into the water tank of your toilet and then flush. This will help to get rid of germs and odour, making your bathroom smell fresh.