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.
To clean a toilet with bleach, measure a half cup of dry bleach powder and allow it to sit in the bowl for up to two hours. Flush once you see that stains are removed. As a last resort, use a pumice stone and a toothbrush to get rid of extreme toilet stains. Keeping one end of the pumice damp, rub the stone across toilet rings, but be sure to do so cautiously. Pumice can easily scratch a toilet bowl, leaving it damaged beyond repair.